diff --git a/tests/.gitignore b/tests/.gitignore
index 6dfbd0f..a2d24f8 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -3,3 +3,4 @@
 /test*.c
 /reduce-criteria.sh
 /creduce_bug_*
+__pycache__