diff --git a/src/YouTube.js b/src/YouTube.js
index 152e94d9..e42ea170 100644
--- a/src/YouTube.js
+++ b/src/YouTube.js
@@ -4,8 +4,8 @@ export const shouldTransform = url => {
   const { host, pathname, searchParams } = new URL(url);
 
   return (
-    host.endsWith('youtu.be') ||
-    (host.endsWith('youtube.com') &&
+    host === 'youtu.be' ||
+    (host === 'youtube.com' &&
       pathname.includes('/watch') &&
       Boolean(searchParams.get('v')))
   );
diff --git a/src/__tests__/YouTube.js b/src/__tests__/YouTube.js
index 3e04185d..f1076382 100644
--- a/src/__tests__/YouTube.js
+++ b/src/__tests__/YouTube.js
@@ -17,6 +17,18 @@ cases(
       url: 'https://not-a-youtube-url.com',
       valid: false,
     },
+    "non-YouTube url ending with 'youtu.be'": {
+      url: 'https://this-is-not-youtu.be',
+      valid: false,
+    },
+    "non-YouTube url ending with 'youtube.com'": {
+      url: 'https://this-is-not-youtube.com',
+      valid: false,
+    },
+    "non-YouTube url ending with 'youtube.com' and having a valid video path": {
+      url: 'https://this-is-not-youtube.com/watch?v=dQw4w9WgXcQ',
+      valid: false,
+    },
     'short url': {
       url: 'https://youtu.be/dQw4w9WgXcQ',
       valid: true,