diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 234643e4dd7..2159de9015a 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -3778,11 +3778,6 @@ LockManagerShmemSize(void)
 	max_table_size *= 2;
 	size = add_size(size, hash_estimate_size(max_table_size, sizeof(PROCLOCK)));
 
-	/*
-	 * Since NLOCKENTS is only an estimate, add 10% safety margin.
-	 */
-	size = add_size(size, size / 10);
-
 	return size;
 }