diff --git a/include/jemalloc/internal/chunk.h b/include/jemalloc/internal/chunk.h
index a6f6f7c3..ddfa0046 100644
--- a/include/jemalloc/internal/chunk.h
+++ b/include/jemalloc/internal/chunk.h
@@ -22,8 +22,6 @@
 extern size_t		opt_lg_chunk;
 extern const char	*opt_dss;
 
-extern rtree_t		chunks_rtree;
-
 extern size_t		chunksize;
 extern size_t		chunksize_mask; /* (chunksize - 1). */
 extern size_t		chunk_npages;
@@ -67,19 +65,6 @@ void	chunk_postfork_child(tsdn_t *tsdn);
 /******************************************************************************/
 #ifdef JEMALLOC_H_INLINES
 
-#ifndef JEMALLOC_ENABLE_INLINE
-extent_t	*chunk_lookup(tsdn_t *tsdn, const void *chunk, bool dependent);
-#endif
-
-#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_CHUNK_C_))
-JEMALLOC_INLINE extent_t *
-chunk_lookup(tsdn_t *tsdn, const void *ptr, bool dependent)
-{
-
-	return (rtree_read(tsdn, &chunks_rtree, (uintptr_t)ptr, dependent));
-}
-#endif
-
 #endif /* JEMALLOC_H_INLINES */
 /******************************************************************************/
 
diff --git a/include/jemalloc/internal/extent.h b/include/jemalloc/internal/extent.h
index b590ae0f..8552f701 100644
--- a/include/jemalloc/internal/extent.h
+++ b/include/jemalloc/internal/extent.h
@@ -87,6 +87,8 @@ typedef ph(extent_t) extent_heap_t;
 /******************************************************************************/
 #ifdef JEMALLOC_H_EXTERNS
 
+extern rtree_t		extents_rtree;
+
 extent_t	*extent_alloc(tsdn_t *tsdn, arena_t *arena);
 void	extent_dalloc(tsdn_t *tsdn, arena_t *arena, extent_t *extent);
 
@@ -101,11 +103,14 @@ size_t	extent_size_quantize_ceil(size_t size);
 
 ph_proto(, extent_heap_, extent_heap_t, extent_t)
 
+bool	extent_boot(void);
+
 #endif /* JEMALLOC_H_EXTERNS */
 /******************************************************************************/
 #ifdef JEMALLOC_H_INLINES
 
 #ifndef JEMALLOC_ENABLE_INLINE
+extent_t	*extent_lookup(tsdn_t *tsdn, const void *chunk, bool dependent);
 arena_t	*extent_arena_get(const extent_t *extent);
 void	*extent_base_get(const extent_t *extent);
 void	*extent_addr_get(const extent_t *extent);
@@ -140,6 +145,13 @@ void	extent_ring_remove(extent_t *extent);
 #endif
 
 #if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_EXTENT_C_))
+JEMALLOC_INLINE extent_t *
+extent_lookup(tsdn_t *tsdn, const void *ptr, bool dependent)
+{
+
+	return (rtree_read(tsdn, &extents_rtree, (uintptr_t)ptr, dependent));
+}
+
 JEMALLOC_INLINE arena_t *
 extent_arena_get(const extent_t *extent)
 {
diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 58a18ae5..fb3991bc 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -510,9 +510,9 @@ void	jemalloc_postfork_child(void);
 #include "jemalloc/internal/witness.h"
 #include "jemalloc/internal/mutex.h"
 #include "jemalloc/internal/mb.h"
+#include "jemalloc/internal/rtree.h"
 #include "jemalloc/internal/extent.h"
 #include "jemalloc/internal/base.h"
-#include "jemalloc/internal/rtree.h"
 #include "jemalloc/internal/pages.h"
 #include "jemalloc/internal/chunk.h"
 #include "jemalloc/internal/large.h"
@@ -929,7 +929,7 @@ JEMALLOC_ALWAYS_INLINE extent_t *
 iealloc(tsdn_t *tsdn, const void *ptr)
 {
 
-	return (chunk_lookup(tsdn, ptr, true));
+	return (extent_lookup(tsdn, ptr, true));
 }
 #endif
 
@@ -1062,7 +1062,7 @@ ivsalloc(tsdn_t *tsdn, const void *ptr)
 	extent_t *extent;
 
 	/* Return 0 if ptr is not within a chunk managed by jemalloc. */
-	extent = chunk_lookup(tsdn, ptr, false);
+	extent = extent_lookup(tsdn, ptr, false);
 	if (extent == NULL)
 		return (0);
 	assert(extent_active_get(extent));
diff --git a/include/jemalloc/internal/private_symbols.txt b/include/jemalloc/internal/private_symbols.txt
index b5fd4c0c..92f91e44 100644
--- a/include/jemalloc/internal/private_symbols.txt
+++ b/include/jemalloc/internal/private_symbols.txt
@@ -132,7 +132,6 @@ chunk_dss_prec_get
 chunk_dss_prec_set
 chunk_dss_prefork
 chunk_in_dss
-chunk_lookup
 chunk_merge_wrapper
 chunk_npages
 chunk_postfork_child
@@ -140,7 +139,6 @@ chunk_postfork_parent
 chunk_prefork
 chunk_purge_wrapper
 chunk_split_wrapper
-chunks_rtree
 chunksize
 chunksize_mask
 ckh_count
@@ -173,6 +171,7 @@ extent_arena_get
 extent_arena_set
 extent_base_get
 extent_before_get
+extent_boot
 extent_committed_get
 extent_committed_set
 extent_dalloc
@@ -187,6 +186,7 @@ extent_hooks_get
 extent_hooks_set
 extent_init
 extent_last_get
+extent_lookup
 extent_past_get
 extent_prof_tctx_get
 extent_prof_tctx_set
@@ -205,6 +205,7 @@ extent_usize_get
 extent_usize_set
 extent_zeroed_get
 extent_zeroed_set
+extents_rtree
 ffs_llu
 ffs_lu
 ffs_u
diff --git a/src/chunk.c b/src/chunk.c
index 7f80bb42..3ce6e015 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -11,8 +11,6 @@ size_t		opt_lg_chunk = 0;
 static size_t	curchunks;
 static size_t	highchunks;
 
-rtree_t		chunks_rtree;
-
 /* Various chunk-related settings. */
 size_t		chunksize;
 size_t		chunksize_mask; /* (chunksize - 1). */
@@ -161,14 +159,14 @@ extent_rtree_acquire(tsdn_t *tsdn, const extent_t *extent, bool dependent,
     bool init_missing, rtree_elm_t **r_elm_a, rtree_elm_t **r_elm_b)
 {
 
-	*r_elm_a = rtree_elm_acquire(tsdn, &chunks_rtree,
+	*r_elm_a = rtree_elm_acquire(tsdn, &extents_rtree,
 	    (uintptr_t)extent_base_get(extent), dependent, init_missing);
 	if (!dependent && *r_elm_a == NULL)
 		return (true);
 	assert(*r_elm_a != NULL);
 
 	if (extent_size_get(extent) > PAGE) {
-		*r_elm_b = rtree_elm_acquire(tsdn, &chunks_rtree,
+		*r_elm_b = rtree_elm_acquire(tsdn, &extents_rtree,
 		    (uintptr_t)extent_last_get(extent), dependent,
 		    init_missing);
 		if (!dependent && *r_elm_b == NULL)
@@ -185,18 +183,18 @@ extent_rtree_write_acquired(tsdn_t *tsdn, rtree_elm_t *elm_a,
     rtree_elm_t *elm_b, const extent_t *extent)
 {
 
-	rtree_elm_write_acquired(tsdn, &chunks_rtree, elm_a, extent);
+	rtree_elm_write_acquired(tsdn, &extents_rtree, elm_a, extent);
 	if (elm_b != NULL)
-		rtree_elm_write_acquired(tsdn, &chunks_rtree, elm_b, extent);
+		rtree_elm_write_acquired(tsdn, &extents_rtree, elm_b, extent);
 }
 
 static void
 extent_rtree_release(tsdn_t *tsdn, rtree_elm_t *elm_a, rtree_elm_t *elm_b)
 {
 
-	rtree_elm_release(tsdn, &chunks_rtree, elm_a);
+	rtree_elm_release(tsdn, &extents_rtree, elm_a);
 	if (elm_b != NULL)
-		rtree_elm_release(tsdn, &chunks_rtree, elm_b);
+		rtree_elm_release(tsdn, &extents_rtree, elm_b);
 }
 
 static void
@@ -207,7 +205,7 @@ chunk_interior_register(tsdn_t *tsdn, const extent_t *extent)
 	assert(extent_slab_get(extent));
 
 	for (i = 1; i < (extent_size_get(extent) >> LG_PAGE) - 1; i++) {
-		rtree_write(tsdn, &chunks_rtree,
+		rtree_write(tsdn, &extents_rtree,
 		    (uintptr_t)extent_base_get(extent) + (uintptr_t)(i <<
 		    LG_PAGE), extent);
 	}
@@ -252,7 +250,7 @@ chunk_interior_deregister(tsdn_t *tsdn, const extent_t *extent)
 	assert(extent_slab_get(extent));
 
 	for (i = 1; i < (extent_size_get(extent) >> LG_PAGE) - 1; i++) {
-		rtree_clear(tsdn, &chunks_rtree,
+		rtree_clear(tsdn, &extents_rtree,
 		    (uintptr_t)extent_base_get(extent) + (uintptr_t)(i <<
 		    LG_PAGE));
 	}
@@ -335,15 +333,15 @@ chunk_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t *extent_hooks,
 	if (new_addr != NULL) {
 		rtree_elm_t *elm;
 
-		elm = rtree_elm_acquire(tsdn, &chunks_rtree,
+		elm = rtree_elm_acquire(tsdn, &extents_rtree,
 		    (uintptr_t)new_addr, false, false);
 		if (elm != NULL) {
-			extent = rtree_elm_read_acquired(tsdn, &chunks_rtree,
+			extent = rtree_elm_read_acquired(tsdn, &extents_rtree,
 			    elm);
 			if (extent != NULL && (extent_active_get(extent) ||
 			    extent_retained_get(extent) == cache))
 				extent = NULL;
-			rtree_elm_release(tsdn, &chunks_rtree, elm);
+			rtree_elm_release(tsdn, &extents_rtree, elm);
 		} else
 			extent = NULL;
 	} else
@@ -651,12 +649,12 @@ chunk_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t *extent_hooks,
 		extent_slab_set(extent, false);
 	}
 
-	assert(chunk_lookup(tsdn, extent_base_get(extent), true) == extent);
+	assert(extent_lookup(tsdn, extent_base_get(extent), true) == extent);
 	extent_heaps_insert(extent_heaps, extent);
 	arena_chunk_cache_maybe_insert(arena, extent, cache);
 
 	/* Try to coalesce forward. */
-	next = rtree_read(tsdn, &chunks_rtree,
+	next = rtree_read(tsdn, &extents_rtree,
 	    (uintptr_t)extent_past_get(extent), false);
 	if (next != NULL) {
 		chunk_try_coalesce(tsdn, arena, extent_hooks, extent, next,
@@ -664,7 +662,7 @@ chunk_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t *extent_hooks,
 	}
 
 	/* Try to coalesce backward. */
-	prev = rtree_read(tsdn, &chunks_rtree,
+	prev = rtree_read(tsdn, &extents_rtree,
 	    (uintptr_t)extent_before_get(extent), false);
 	if (prev != NULL) {
 		chunk_try_coalesce(tsdn, arena, extent_hooks, prev, extent,
@@ -907,12 +905,12 @@ chunk_merge_wrapper(tsdn_t *tsdn, arena_t *arena, extent_hooks_t *extent_hooks,
 	extent_rtree_acquire(tsdn, b, true, false, &b_elm_a, &b_elm_b);
 
 	if (a_elm_b != NULL) {
-		rtree_elm_write_acquired(tsdn, &chunks_rtree, a_elm_b, NULL);
-		rtree_elm_release(tsdn, &chunks_rtree, a_elm_b);
+		rtree_elm_write_acquired(tsdn, &extents_rtree, a_elm_b, NULL);
+		rtree_elm_release(tsdn, &extents_rtree, a_elm_b);
 	}
 	if (b_elm_b != NULL) {
-		rtree_elm_write_acquired(tsdn, &chunks_rtree, b_elm_a, NULL);
-		rtree_elm_release(tsdn, &chunks_rtree, b_elm_a);
+		rtree_elm_write_acquired(tsdn, &extents_rtree, b_elm_a, NULL);
+		rtree_elm_release(tsdn, &extents_rtree, b_elm_a);
 	} else
 		b_elm_b = b_elm_a;
 
@@ -963,9 +961,6 @@ chunk_boot(void)
 
 	if (have_dss && chunk_dss_boot())
 		return (true);
-	if (rtree_new(&chunks_rtree, (unsigned)((ZU(1) << (LG_SIZEOF_PTR+3)) -
-	    LG_PAGE)))
-		return (true);
 
 	return (false);
 }
diff --git a/src/extent.c b/src/extent.c
index 2f929a83..3e62e3bc 100644
--- a/src/extent.c
+++ b/src/extent.c
@@ -1,6 +1,11 @@
 #define	JEMALLOC_EXTENT_C_
 #include "jemalloc/internal/jemalloc_internal.h"
 
+/******************************************************************************/
+/* Data. */
+
+rtree_t		extents_rtree;
+
 /******************************************************************************/
 
 extent_t *
@@ -112,3 +117,14 @@ extent_ad_comp(const extent_t *a, const extent_t *b)
 
 /* Generate pairing heap functions. */
 ph_gen(, extent_heap_, extent_heap_t, extent_t, ph_link, extent_ad_comp)
+
+bool
+extent_boot(void)
+{
+
+	if (rtree_new(&extents_rtree, (unsigned)((ZU(1) << (LG_SIZEOF_PTR+3)) -
+	    LG_PAGE)))
+		return (true);
+
+	return (false);
+}
diff --git a/src/jemalloc.c b/src/jemalloc.c
index a9bba12b..03e61df6 100644
--- a/src/jemalloc.c
+++ b/src/jemalloc.c
@@ -1232,6 +1232,8 @@ malloc_init_hard_a0_locked()
 		return (true);
 	if (chunk_boot())
 		return (true);
+	if (extent_boot())
+		return (true);
 	if (ctl_boot())
 		return (true);
 	if (config_prof)
diff --git a/test/unit/arena_reset.c b/test/unit/arena_reset.c
index a9476b89..61caf3c5 100644
--- a/test/unit/arena_reset.c
+++ b/test/unit/arena_reset.c
@@ -70,7 +70,7 @@ vsalloc(tsdn_t *tsdn, const void *ptr)
 {
 	extent_t *extent;
 
-	extent = chunk_lookup(tsdn, ptr, false);
+	extent = extent_lookup(tsdn, ptr, false);
 	if (extent == NULL)
 		return (0);
 	if (!extent_active_get(extent))