diff --git a/pw_presubmit/py/pw_presubmit/banned_words.py b/pw_presubmit/py/pw_presubmit/banned_words.py
index f0812ac..8c789e6 100644
--- a/pw_presubmit/py/pw_presubmit/banned_words.py
+++ b/pw_presubmit/py/pw_presubmit/banned_words.py
@@ -115,7 +115,7 @@
                     # Not using 'continue' so this line always executes.
                     prev = line
 
-        except UnicodeDecodeError:
+        except (UnicodeDecodeError, IsADirectoryError):
             # File is not text, like a gif.
             pass