diff --git a/src/backend/distributed/relay/relay_event_utility.c b/src/backend/distributed/relay/relay_event_utility.c
index 3c50b206b..b12146784 100644
--- a/src/backend/distributed/relay/relay_event_utility.c
+++ b/src/backend/distributed/relay/relay_event_utility.c
@@ -164,6 +164,7 @@ RelayEventExtendNames(Node *parseTree, char *schemaName, uint64 shardId)
 			 * performed on CreateStmt should be done here too, we simply *fall
 			 * through* to avoid code repetition.
 			 */
+			__attribute__((fallthrough));
 		}
 
 		case T_CreateStmt:
diff --git a/src/backend/distributed/utils/ruleutils_96.c b/src/backend/distributed/utils/ruleutils_96.c
index 3e4a38ddf..7a72dfe89 100644
--- a/src/backend/distributed/utils/ruleutils_96.c
+++ b/src/backend/distributed/utils/ruleutils_96.c
@@ -4449,6 +4449,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
 				}
 				/* else do the same stuff as for T_SubLink et al. */
 				/* FALL THROUGH */
+				__attribute__((fallthrough));
 			}
 
 		case T_SubLink: