diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 9347329e624..f8f63bfe0f7 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5777,7 +5777,7 @@ namespace ts {
                 for (const propertySymbol of getPropertiesOfType(modifiersType)) {
                     addMemberForKeyType(getLiteralTypeFromPropertyName(propertySymbol), propertySymbol);
                 }
-                if (getIndexInfoOfType(modifiersType, IndexKind.String)) {
+                if (modifiersType.flags & TypeFlags.Any || getIndexInfoOfType(modifiersType, IndexKind.String)) {
                     addMemberForKeyType(stringType);
                 }
             }
@@ -8386,7 +8386,7 @@ namespace ts {
         }
 
         function isMappableType(type: Type) {
-            return type.flags & (TypeFlags.TypeParameter | TypeFlags.Object | TypeFlags.Intersection | TypeFlags.IndexedAccess);
+            return type.flags & (TypeFlags.Any | TypeFlags.TypeParameter | TypeFlags.Object | TypeFlags.Intersection | TypeFlags.IndexedAccess);
         }
 
         function instantiateAnonymousType(type: AnonymousType, mapper: TypeMapper): AnonymousType {