diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 03bbb9f..2778374 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -3954,6 +3954,7 @@ RelationGetIndexAttrBitmap(Relation relation, IndexAttrBitmapKind attrKind)
 			return indexattrs;
 		default:
 			elog(ERROR, "unknown attrKind %u", attrKind);
+			return 0; /* keep compiler quiet */
 	}
 }
 
