diff --git a/.github/scripts/generate-matrix.sh b/.github/scripts/generate-matrix.sh
index c995dd6..3485c3a 100755
--- a/.github/scripts/generate-matrix.sh
+++ b/.github/scripts/generate-matrix.sh
@@ -36,7 +36,7 @@ else
   echo ""
 
   # Collect changed files/folders, filter out .github and docs
-  DIFF=$( git diff --dirstat=files,0,cumulative "$BASE_SHA" "$GITHUB_SHA" | awk -F ' ' '{print $2}' | grep -vE '(^.github)' || true )
+  DIFF=$( git diff --dirstat=files,0,cumulative "$BASE_SHA" "$HEAD_SHA" | awk -F ' ' '{print $2}' | grep -vE '(^.github)' || true )
   echo "--DIFF--"
   echo "$DIFF"
   echo ""
diff --git a/folder_1/sample2.txt b/folder_1/sample2.txt
new file mode 100644
index 0000000..2a67f8c
--- /dev/null
+++ b/folder_1/sample2.txt
@@ -0,0 +1 @@
+another test file
\ No newline at end of file