diff --git a/lib/index.js b/lib/index.js
index 7056641..59196d9 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -121,7 +121,7 @@ function generateRequireInfo (moduleId) {
     moduleId: moduleId,
     callingFile: callingFile,
     native: native,
-    extname: path.extname(absPath),
+    extname: absPath? path.extname(absPath): '',
     thirdParty: thirdParty,
     absPath: absPath,
     absPathResolvedCorrectly: absPathResolvedCorrectly,
diff --git a/test/test.js b/test/test.js
index dd9f08e..058ecd6 100644
--- a/test/test.js
+++ b/test/test.js
@@ -88,6 +88,14 @@ describe("intercept-require", function () {
       restore();
     });
 
+    it("should not throw on native modules", function () {
+      const restore = intercept(() => {});
+      expect(function() {
+        require('fs');
+      }).toNotThrow();
+      restore();
+    });
+
     it("passes the result and some info to the listener", function () {
       let calc, result, info;
       function listener (r, i) {