diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 590b28f5cd4..1b3084f9cbd 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -8816,7 +8816,8 @@ namespace ts {
                     }
                 }
 
-                if (!(source.flags & TypeFlags.UnionOrIntersection) &&
+                if (relation !== comparableRelation &&
+                    !(source.flags & TypeFlags.UnionOrIntersection) &&
                     !(target.flags & TypeFlags.Union) &&
                     !isIntersectionConstituent &&
                     source !== globalObjectType &&