diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 41dfd35b8ca..cf3c25893af 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -7519,10 +7519,10 @@ module ts {
                                 return undefined;
                             }
                             var property = getPropertyOfObjectType(enumType, propertyName);
-                            if (!(property.flags & SymbolFlags.EnumMember)) {
+                            if (!property || !(property.flags & SymbolFlags.EnumMember)) {
                                 return undefined;
                             }
-                            var propertyDecl = <EnumMember>property.valueDeclaration;
+                            var propertyDecl = property.valueDeclaration;
                             // self references are illegal
                             if (member === propertyDecl) {
                                 return undefined;