diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c
index 283ffaea77d..d1dadc54e47 100644
--- a/src/backend/commands/vacuum.c
+++ b/src/backend/commands/vacuum.c
@@ -2317,7 +2317,7 @@ vac_cleanup_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)
  * Returns the total required space for VACUUM's dead_items array given a
  * max_items value.
  */
-inline Size
+Size
 vac_max_items_to_alloc_size(int max_items)
 {
 	Assert(max_items <= MAXDEADITEMS(MaxAllocSize));