diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 0fdb88110eb..8342dbc2291 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -14600,7 +14600,7 @@ namespace ts {
          * with no call or construct signatures.
          */
         function isObjectTypeWithInferableIndex(type: Type) {
-            return type.symbol && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum| SymbolFlags.ValueModule)) !== 0 &&
+            return type.symbol && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum | SymbolFlags.ValueModule)) !== 0 &&
                 !typeHasCallOrConstructSignatures(type);
         }