diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c
index 6a9ea3671074..2cc6754ef4f9 100644
--- a/src/backend/utils/mmgr/aset.c
+++ b/src/backend/utils/mmgr/aset.c
@@ -1683,7 +1683,7 @@ AllocSetCheck(MemoryContext context)
 	const char *name = set->header.name;
 	AllocBlock	prevblock;
 	AllocBlock	block;
-	Size		total_allocated = 0;
+	Size		total_allocated PG_USED_FOR_ASSERTS_ONLY = 0;
 
 	for (prevblock = NULL, block = set->blocks;
 		 block != NULL;
diff --git a/src/backend/utils/mmgr/bump.c b/src/backend/utils/mmgr/bump.c
index 9bb579935dbd..eba52f89bce4 100644
--- a/src/backend/utils/mmgr/bump.c
+++ b/src/backend/utils/mmgr/bump.c
@@ -769,7 +769,7 @@ BumpCheck(MemoryContext context)
 	BumpContext *bump = (BumpContext *) context;
 	const char *name = context->name;
 	dlist_iter	iter;
-	Size		total_allocated = 0;
+	Size		total_allocated PG_USED_FOR_ASSERTS_ONLY = 0;
 
 	/* walk all blocks in this context */
 	dlist_foreach(iter, &bump->blocks)
diff --git a/src/backend/utils/mmgr/generation.c b/src/backend/utils/mmgr/generation.c
index 609c9bdc9a6b..0fcc79ec93f2 100644
--- a/src/backend/utils/mmgr/generation.c
+++ b/src/backend/utils/mmgr/generation.c
@@ -1134,7 +1134,7 @@ GenerationCheck(MemoryContext context)
 	GenerationContext *gen = (GenerationContext *) context;
 	const char *name = context->name;
 	dlist_iter	iter;
-	Size		total_allocated = 0;
+	Size		total_allocated PG_USED_FOR_ASSERTS_ONLY = 0;
 
 	/* walk all blocks in this context */
 	dlist_foreach(iter, &gen->blocks)
diff --git a/src/backend/utils/mmgr/slab.c b/src/backend/utils/mmgr/slab.c
index 2ad325547fdc..9ae3f0c8c115 100644
--- a/src/backend/utils/mmgr/slab.c
+++ b/src/backend/utils/mmgr/slab.c
@@ -1038,7 +1038,7 @@ SlabCheck(MemoryContext context)
 {
 	SlabContext *slab = (SlabContext *) context;
 	int			i;
-	int			nblocks = 0;
+	int			nblocks PG_USED_FOR_ASSERTS_ONLY = 0;
 	const char *name = slab->header.name;
 	dlist_iter	iter;