diff --git a/lib/getDefinePropertySrc.js b/lib/getDefinePropertySrc.js
index 95dd9f2..b856a7f 100644
--- a/lib/getDefinePropertySrc.js
+++ b/lib/getDefinePropertySrc.js
@@ -18,10 +18,11 @@ function getDefinePropertySrc() {
             value +
             "', {enumerable: false, value: " +
             srcs[value] +
-            "}); ";
+            ", "+
+            "writable: true}); ";
     }, "");
 
     return src;
 }
 
-module.exports = getDefinePropertySrc;
\ No newline at end of file
+module.exports = getDefinePropertySrc;
diff --git a/test/testModules/sharedTestCases.js b/test/testModules/sharedTestCases.js
index 7048ba8..ccbafa3 100644
--- a/test/testModules/sharedTestCases.js
+++ b/test/testModules/sharedTestCases.js
@@ -66,16 +66,17 @@ describe("rewire " + (typeof testEnv === "undefined"? "(node)": "(" + testEnv +
         expect(rewire("./moduleB.js").__with__.toString()).to.be(__with__Src);
     });
 
-    it("should provide __set__ as a non-enumerable property", function () {
-        expect(Object.keys(rewire("./moduleA.js")).indexOf("__set__")).to.be(-1)
-    });
 
-    it("should provide __get__ as a non-enumerable property", function () {
-        expect(Object.keys(rewire("./moduleA.js")).indexOf("__get__")).to.be(-1)
-    });
+    ["__get__", "__set__", "__with__"].forEach(function(funcName) {
+        it("should provide " + funcName + " as a non-enumerable property", function () {
+            expect(Object.keys(rewire("./moduleA.js")).indexOf(funcName)).to.be(-1)
+        });
 
-    it("should provide __with__ as a non-enumerable property", function () {
-        expect(Object.keys(rewire("./moduleA.js")).indexOf("__with__")).to.be(-1)
+        it("should provide " + funcName + " as a writable property", function () {
+            var obj = rewire("./moduleA.js");
+            var desc = Object.getOwnPropertyDescriptor(obj, funcName);
+            expect(desc.writable).to.be(true);
+        });
     });
 
     it("should not influence other modules", function () {