diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 30edecf3b40..8ae8ab3d54c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6334,7 +6334,7 @@ namespace ts {
                         }
 
                         // Use original type if construct contains assignments to variable
-                        if (!nodeStack.length && isVariableAssignedWithin(symbol, node)) {
+                        if (type != originalType && isVariableAssignedWithin(symbol, node)) {
                             type = originalType;
                         }
                     }