diff --git a/include/jemalloc/internal/pa.h b/include/jemalloc/internal/pa.h
index 9cf290c2..8c82823c 100644
--- a/include/jemalloc/internal/pa.h
+++ b/include/jemalloc/internal/pa.h
@@ -229,4 +229,7 @@ void pa_shard_prefork4(tsdn_t *tsdn, pa_shard_t *shard);
 void pa_shard_postfork_parent(tsdn_t *tsdn, pa_shard_t *shard);
 void pa_shard_postfork_child(tsdn_t *tsdn, pa_shard_t *shard);
 
+void pa_shard_basic_stats_merge(pa_shard_t *shard, size_t *nactive,
+    size_t *ndirty, size_t *nmuzzy);
+
 #endif /* JEMALLOC_INTERNAL_PA_H */
diff --git a/src/arena.c b/src/arena.c
index dc8c26b6..10a24688 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -71,9 +71,7 @@ arena_basic_stats_merge(tsdn_t *tsdn, arena_t *arena, unsigned *nthreads,
 	*dss = dss_prec_names[arena_dss_prec_get(arena)];
 	*dirty_decay_ms = arena_dirty_decay_ms_get(arena);
 	*muzzy_decay_ms = arena_muzzy_decay_ms_get(arena);
-	*nactive += atomic_load_zu(&arena->pa_shard.nactive, ATOMIC_RELAXED);
-	*ndirty += ecache_npages_get(&arena->pa_shard.ecache_dirty);
-	*nmuzzy += ecache_npages_get(&arena->pa_shard.ecache_muzzy);
+	pa_shard_basic_stats_merge(&arena->pa_shard, nactive, ndirty, nmuzzy);
 }
 
 void
diff --git a/src/pa_extra.c b/src/pa_extra.c
index bfb0a004..1b642df2 100644
--- a/src/pa_extra.c
+++ b/src/pa_extra.c
@@ -53,3 +53,11 @@ pa_shard_postfork_child(tsdn_t *tsdn, pa_shard_t *shard) {
 	malloc_mutex_postfork_child(tsdn, &shard->decay_dirty.mtx);
 	malloc_mutex_postfork_child(tsdn, &shard->decay_muzzy.mtx);
 }
+
+void
+pa_shard_basic_stats_merge(pa_shard_t *shard, size_t *nactive, size_t *ndirty,
+    size_t *nmuzzy) {
+	*nactive += atomic_load_zu(&shard->nactive, ATOMIC_RELAXED);
+	*ndirty += ecache_npages_get(&shard->ecache_dirty);
+	*nmuzzy += ecache_npages_get(&shard->ecache_muzzy);
+}