diff --git a/lib/bypass.js b/lib/bypass.js
index 4d6b29c..a65aada 100755
--- a/lib/bypass.js
+++ b/lib/bypass.js
@@ -18,9 +18,8 @@ exports = module.exports = function bypass(fn) {
   let result;
   try {
     result = fn();
-  } finally {
     if (result && typeof result.then === 'function') {
-      result.then(
+      return result.then(
         r => {
           enable();
           return r;
@@ -32,10 +31,12 @@ exports = module.exports = function bypass(fn) {
       );
     } else {
       enable();
+      return result;
     }
+  } catch (err) {
+    enable();
+    throw err;
   }
-
-  return result;
 };
 
 /**
diff --git a/test/lib/bypass.spec.js b/test/lib/bypass.spec.js
index 5040eed..458e73b 100644
--- a/test/lib/bypass.spec.js
+++ b/test/lib/bypass.spec.js
@@ -64,10 +64,8 @@ describe('mock.bypass()', () => {
     assert.equal(fs.readFileSync('/path/to/file', 'utf8'), 'content');
     assert.isFalse(fs.existsSync(__filename));
 
-    const promise = mock.bypass(() => fs.promises.stat(__filename));
-    assert.instanceOf(promise, Promise);
-
-    promise
+    mock
+      .bypass(() => fs.promises.stat(__filename))
       .then(stat => {
         assert.isTrue(stat.isFile());
         assert.isFalse(fs.existsSync(__filename));
@@ -84,13 +82,11 @@ describe('mock.bypass()', () => {
 
     const error = new Error('oops');
 
-    const promise = mock.bypass(() => {
-      assert.isTrue(fs.existsSync(__filename));
-      return Promise.reject(error);
-    });
-    assert.instanceOf(promise, Promise);
-
-    promise
+    mock
+      .bypass(() => {
+        assert.isTrue(fs.existsSync(__filename));
+        return Promise.reject(error);
+      })
       .then(() => {
         done(new Error('should not succeed'));
       })