diff --git a/.gitignore b/.gitignore
index ecd10a3..4a2cfda 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,6 +38,7 @@ output_*/
 logs/
 --detailed/
 --verbose/
+--gcow/
 .work/
 test_prog_*/
 _test_flatfiles/