diff --git a/include/jemalloc/internal/pa.h b/include/jemalloc/internal/pa.h
index 9482380a..e5a46f95 100644
--- a/include/jemalloc/internal/pa.h
+++ b/include/jemalloc/internal/pa.h
@@ -18,13 +18,6 @@
  * others will be coming soon.
  */
 
-enum pa_decay_purge_setting_e {
-	PA_DECAY_PURGE_ALWAYS,
-	PA_DECAY_PURGE_NEVER,
-	PA_DECAY_PURGE_ON_EPOCH_ADVANCE
-};
-typedef enum pa_decay_purge_setting_e pa_decay_purge_setting_t;
-
 /*
  * The stats for a particular pa_shard.  Because of the way the ctl module
  * handles stats epoch data collection (it has its own arena_stats, and merges
@@ -163,7 +156,7 @@ void pa_decay_all(tsdn_t *tsdn, pa_shard_t *shard, decay_t *decay,
  */
 bool pa_maybe_decay_purge(tsdn_t *tsdn, pa_shard_t *shard, decay_t *decay,
     pac_decay_stats_t *decay_stats, ecache_t *ecache,
-    pa_decay_purge_setting_t decay_purge_setting);
+    pac_decay_purge_setting_t decay_purge_setting);
 
 /*
  * Gets / sets the maximum amount that we'll grow an arena down the
diff --git a/include/jemalloc/internal/pac.h b/include/jemalloc/internal/pac.h
index d1d68534..aa4a76af 100644
--- a/include/jemalloc/internal/pac.h
+++ b/include/jemalloc/internal/pac.h
@@ -9,6 +9,14 @@
  * - Can use efficient OS-level zeroing primitives for demand-filled pages.
  */
 
+/* How "eager" decay/purging should be. */
+enum pac_decay_purge_setting_e {
+	PAC_DECAY_PURGE_ALWAYS,
+	PAC_DECAY_PURGE_NEVER,
+	PAC_DECAY_PURGE_ON_EPOCH_ADVANCE
+};
+typedef enum pac_decay_purge_setting_e pac_decay_purge_setting_t;
+
 typedef struct pac_decay_stats_s pac_decay_stats_t;
 struct pac_decay_stats_s {
 	/* Total number of purge sweeps. */
diff --git a/src/arena.c b/src/arena.c
index 619060f4..95dea18f 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -410,14 +410,14 @@ arena_muzzy_decay_ms_get(arena_t *arena) {
  * specifically requested it), should we purge ourselves, or wait for the
  * background thread to get to it.
  */
-static pa_decay_purge_setting_t
+static pac_decay_purge_setting_t
 arena_decide_unforced_decay_purge_setting(bool is_background_thread) {
 	if (is_background_thread) {
-		return PA_DECAY_PURGE_ALWAYS;
+		return PAC_DECAY_PURGE_ALWAYS;
 	} else if (!is_background_thread && background_thread_enabled()) {
-		return PA_DECAY_PURGE_NEVER;
+		return PAC_DECAY_PURGE_NEVER;
 	} else {
-		return PA_DECAY_PURGE_ON_EPOCH_ADVANCE;
+		return PAC_DECAY_PURGE_ON_EPOCH_ADVANCE;
 	}
 }
 
@@ -440,7 +440,7 @@ arena_decay_ms_set(tsdn_t *tsdn, arena_t *arena, decay_t *decay,
 	nstime_t cur_time;
 	nstime_init_update(&cur_time);
 	decay_reinit(decay, &cur_time, decay_ms);
-	pa_decay_purge_setting_t decay_purge =
+	pac_decay_purge_setting_t decay_purge =
 	    arena_decide_unforced_decay_purge_setting(
 		/* is_background_thread */ false);
 	pa_maybe_decay_purge(tsdn, &arena->pa_shard, decay, decay_stats, ecache,
@@ -497,7 +497,7 @@ arena_decay_impl(tsdn_t *tsdn, arena_t *arena, decay_t *decay,
 		/* No need to wait if another thread is in progress. */
 		return true;
 	}
-	pa_decay_purge_setting_t decay_purge =
+	pac_decay_purge_setting_t decay_purge =
 	    arena_decide_unforced_decay_purge_setting(is_background_thread);
 	bool epoch_advanced = pa_maybe_decay_purge(tsdn, &arena->pa_shard,
 	    decay, decay_stats, ecache, decay_purge);
diff --git a/src/pa.c b/src/pa.c
index e8c88a05..66a9fbc7 100644
--- a/src/pa.c
+++ b/src/pa.c
@@ -403,7 +403,7 @@ pa_decay_try_purge(tsdn_t *tsdn, pa_shard_t *shard, decay_t *decay,
 bool
 pa_maybe_decay_purge(tsdn_t *tsdn, pa_shard_t *shard, decay_t *decay,
     pac_decay_stats_t *decay_stats, ecache_t *ecache,
-    pa_decay_purge_setting_t decay_purge_setting) {
+    pac_decay_purge_setting_t decay_purge_setting) {
 	malloc_mutex_assert_owner(tsdn, &decay->mtx);
 
 	/* Purge all or nothing if the option is disabled. */
@@ -429,9 +429,9 @@ pa_maybe_decay_purge(tsdn_t *tsdn, pa_shard_t *shard, decay_t *decay,
 	size_t npages_current = ecache_npages_get(ecache);
 	bool epoch_advanced = decay_maybe_advance_epoch(decay, &time,
 	    npages_current);
-	if (decay_purge_setting == PA_DECAY_PURGE_ALWAYS
+	if (decay_purge_setting == PAC_DECAY_PURGE_ALWAYS
 	    || (epoch_advanced && decay_purge_setting
-	    == PA_DECAY_PURGE_ON_EPOCH_ADVANCE)) {
+	    == PAC_DECAY_PURGE_ON_EPOCH_ADVANCE)) {
 		size_t npages_limit = decay_npages_limit_get(decay);
 		pa_decay_try_purge(tsdn, shard, decay, decay_stats, ecache,
 		    npages_current, npages_limit);
diff --git a/src/pac.c b/src/pac.c
index 8ff6f1c8..e2e6b58f 100644
--- a/src/pac.c
+++ b/src/pac.c
@@ -76,4 +76,3 @@ pac_retain_grow_limit_get_set(tsdn_t *tsdn, pac_t *pac, size_t *old_limit,
 
 	return false;
 }
-