diff --git a/matcha/text/__init__.py b/matcha/text/__init__.py
index 8c75d6b..a842a73 100644
--- a/matcha/text/__init__.py
+++ b/matcha/text/__init__.py
@@ -48,6 +48,6 @@ def _clean_text(text, cleaner_names):
     for name in cleaner_names:
         cleaner = getattr(cleaners, name)
         if not cleaner:
-            raise Exception("Unknown cleaner: %s" % name)
+            raise Exception(f"Unknown cleaner: {name}")
         text = cleaner(text)
     return text