diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c
index 9f362ce8641..55e4a5421de 100644
--- a/src/backend/storage/ipc/shmem.c
+++ b/src/backend/storage/ipc/shmem.c
@@ -87,7 +87,7 @@
 typedef struct ShmemAllocatorData
 {
 	Size		free_offset;	/* offset to first free space from ShmemBase */
-	HTAB	   *index;			/* copy of ShmemIndex */
+	HASHHDR    *index;			/* location of ShmemIndex */
 
 	/* protects shared memory and LWLock allocation */
 	slock_t		shmem_lock;