diff --git a/include/jemalloc/internal/ehooks.h b/include/jemalloc/internal/ehooks.h
index 128d2f2c..03599b97 100644
--- a/include/jemalloc/internal/ehooks.h
+++ b/include/jemalloc/internal/ehooks.h
@@ -57,13 +57,6 @@ bool ehooks_default_purge_lazy_impl(void *addr, size_t offset, size_t length);
 bool ehooks_default_purge_forced_impl(void *addr, size_t offset, size_t length);
 #endif
 bool ehooks_default_split_impl(void);
-/*
- * Merge is the only default extent hook we declare -- see the comment in
- * ehooks_merge.
- */
-bool ehooks_default_merge(extent_hooks_t *extent_hooks, void *addr_a,
-    size_t size_a, void *addr_b, size_t size_b, bool committed,
-    unsigned arena_ind);
 bool ehooks_default_merge_impl(tsdn_t *tsdn, void *addr_a, void *addr_b);
 void ehooks_default_zero_impl(void *addr, size_t size);
 void ehooks_default_guard_impl(void *guard1, void *guard2);
diff --git a/src/ehooks.c b/src/ehooks.c
index bd9a8ac6..533ba1b4 100644
--- a/src/ehooks.c
+++ b/src/ehooks.c
@@ -228,7 +228,7 @@ ehooks_default_merge_impl(tsdn_t *tsdn, void *addr_a, void *addr_b) {
 	return false;
 }
 
-bool
+static bool
 ehooks_default_merge(extent_hooks_t *extent_hooks, void *addr_a, size_t size_a,
     void *addr_b, size_t size_b, bool committed, unsigned arena_ind) {
 	tsdn_t *tsdn = tsdn_fetch();