diff --git a/contrib/amcheck/verify_nbtree.c b/contrib/amcheck/verify_nbtree.c
index cb6475d41f..1a0606704a 100644
--- a/contrib/amcheck/verify_nbtree.c
+++ b/contrib/amcheck/verify_nbtree.c
@@ -263,7 +263,7 @@ bt_index_check_internal(Oid indrelid, bool parentcheck, bool heapallindexed,
 	else
 	{
 		heaprel = NULL;
-		/* for "gcc -Og" https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78394 */
+		/* Set these just to suppress "uninitialized variable" warnings */
 		save_userid = InvalidOid;
 		save_sec_context = -1;
 		save_nestlevel = -1;
diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index 781cac25d8..d9573bece7 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -919,7 +919,13 @@ brin_summarize_range(PG_FUNCTION_ARGS)
 		save_nestlevel = NewGUCNestLevel();
 	}
 	else
+	{
 		heapRel = NULL;
+		/* Set these just to suppress "uninitialized variable" warnings */
+		save_userid = InvalidOid;
+		save_sec_context = -1;
+		save_nestlevel = -1;
+	}
 
 	indexRel = index_open(indexoid, ShareUpdateExclusiveLock);