diff --git a/dist/redolent-testing.js b/dist/redolent-testing.js
index a008716..e65b27c 100644
--- a/dist/redolent-testing.js
+++ b/dist/redolent-testing.js
@@ -135,6 +135,7 @@ function normalize (promise, Ctor) {
   return promise
 }
 
+/* istanbul ignore next */
 function isPromise (val, Promize$$1) {
   return val instanceof Promize$$1 || (
     val !== null &&
diff --git a/dist/redolent.common.js b/dist/redolent.common.js
index b77f735..857d686 100644
--- a/dist/redolent.common.js
+++ b/dist/redolent.common.js
@@ -409,6 +409,7 @@ function normalize (promise, Ctor) {
   return promise
 }
 
+/* istanbul ignore next */
 function isPromise (val, Promize$$1) {
   return val instanceof Promize$$1 || (
     val !== null &&
diff --git a/dist/redolent.es.js b/dist/redolent.es.js
index 341b487..fa47b5f 100644
--- a/dist/redolent.es.js
+++ b/dist/redolent.es.js
@@ -405,6 +405,7 @@ function normalize (promise, Ctor) {
   return promise
 }
 
+/* istanbul ignore next */
 function isPromise (val, Promize$$1) {
   return val instanceof Promize$$1 || (
     val !== null &&
diff --git a/index.js b/index.js
index ebf864f..58a84b1 100644
--- a/index.js
+++ b/index.js
@@ -135,6 +135,7 @@ function normalize (promise, Ctor) {
   return promise
 }
 
+/* istanbul ignore next */
 function isPromise (val, Promize) {
   return val instanceof Promize || (
     val !== null &&
diff --git a/test.js b/test.js
index 71ca906..173c6dc 100644
--- a/test.js
+++ b/test.js
@@ -198,9 +198,9 @@ if (semver.lt(process.version, '0.12.0')) {
       return 1
     })()
 
-    test.strictEqual(Promise.___nativePromise, true)
-    test.strictEqual(promise.___nativePromise, true)
     promise.then(function (num) {
+      test.strictEqual(Promise.___nativePromise, true)
+      test.strictEqual(promise.___nativePromise, true)
       test.strictEqual(num, 1)
       done()
     }, done).catch(done)