diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8cbc6afdb7..37b1acbbea 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -40,7 +40,7 @@ default_language_version:
 
 exclude: |
   (?x)^(
-    ext/.*|
+    ext/(?!testlib/).*|
     build/.*|
     src/systemc/ext/.*|
     src/systemc/tests/.*/.*|