diff --git a/.kokoro/samples-test.sh b/.kokoro/samples-test.sh
index acad993f0..98e2fbbed 100755
--- a/.kokoro/samples-test.sh
+++ b/.kokoro/samples-test.sh
@@ -51,7 +51,7 @@ if [ -f samples/package.json ]; then
       trap cleanup EXIT HUP
     else
       # Check if there are any changes in the "samples" directory only for presubmits. 
-      if git diff --quiet HEAD~1 HEAD -- samples/; then
+      if git diff --quiet HEAD main -- samples/; then
         echo "No changes detected in the samples directory. Skipping sample tests."
         exit 0
       fi