diff --git a/types/range-parser/index.d.ts b/types/range-parser/index.d.ts
index 13d331041a..e8e6ae4451 100644
--- a/types/range-parser/index.d.ts
+++ b/types/range-parser/index.d.ts
@@ -27,10 +27,9 @@ declare namespace RangeParser {
          */
         combine?: boolean;
     }
-    const enum Result {
-        invaild = -2,
-        unsatisifiable = -1,
-    }
+    type ResultUnsatisfiable = -1;
+    type ResultInvalid = -2;
+    type Result = ResultUnsatisfiable | ResultInvalid;
 }
 
 export = RangeParser;
diff --git a/types/range-parser/range-parser-tests.ts b/types/range-parser/range-parser-tests.ts
index ec1ffa6e4e..2c18e3f9dc 100644
--- a/types/range-parser/range-parser-tests.ts
+++ b/types/range-parser/range-parser-tests.ts
@@ -2,8 +2,8 @@ import RangeParser = require('range-parser');
 
 declare var console: { assert(b: boolean): void };
 
-console.assert(RangeParser(200, `malformed`) === RangeParser.Result.invaild);
-console.assert(RangeParser(200, `bytes=500-20`) === RangeParser.Result.unsatisifiable);
+console.assert(RangeParser(200, `malformed`) === -2);
+console.assert(RangeParser(200, `bytes=500-20`) === -1);
 
 const range = RangeParser(1000, `bytes=0-499`);