diff --git a/hack/test-all.sh b/hack/test-all.sh
index 231a3cc7e0..1717e1f165 100755
--- a/hack/test-all.sh
+++ b/hack/test-all.sh
@@ -22,7 +22,9 @@ setup_envs
 
 header_text "running go test"
 
-go test -race ${MOD_OPT} ./... -parallel 4
+parallal_count=4
+if [[ -n $CI ]]; then parallal_count=1; fi
+go test -race ${MOD_OPT} ./... -parallel $parallal_count
 
 header_text "running coverage"