diff --git a/tests/patch/kdoc/kdoc.sh b/tests/patch/kdoc/kdoc.sh
index a4f96ad..ac36d1b 100755
--- a/tests/patch/kdoc/kdoc.sh
+++ b/tests/patch/kdoc/kdoc.sh
@@ -8,7 +8,7 @@ tmpfile_o=$(mktemp)
 tmpfile_n=$(mktemp)
 rc=0
 
-files=$(git show --pretty="" --name-only HEAD)
+files=$(git diff HEAD^ --pretty= --name-only)
 
 HEAD=$(git rev-parse HEAD)