diff --git a/youtube_dl/extractor/teachable.py b/youtube_dl/extractor/teachable.py
index 5a2df1ce6..375b37ca5 100644
--- a/youtube_dl/extractor/teachable.py
+++ b/youtube_dl/extractor/teachable.py
@@ -140,8 +140,12 @@ class TeachableIE(TeachableBaseIE):
     @staticmethod
     def _is_teachable(webpage):
         return 'teachableTracker.linker:autoLink' in webpage and (
-                re.search(r'<link[^>]+href=["\']https?://process\.fs\.teachablecdn\.com', webpage) or
-                re.search(r'<img[^>]+src=["\']https?://process\.fs\.teachablecdn\.com', webpage))
+            re.search(
+                r'<link[^>]+href=["\']https?://process\.fs\.teachablecdn\.com',
+                webpage)
+            or re.search(
+                r'<img[^>]+src=["\']https?://process\.fs\.teachablecdn\.com',
+                webpage))
 
     @staticmethod
     def _extract_url(webpage, source_url):