diff --git a/hack/test-all.sh b/hack/test-all.sh
index 42d64f006f..d2680c25ce 100755
--- a/hack/test-all.sh
+++ b/hack/test-all.sh
@@ -20,7 +20,18 @@ source $(dirname ${BASH_SOURCE})/common.sh
 
 header_text "running go test"
 
-go test -race ${MOD_OPT} ./...
+# On MacOS there is a strange race condition
+# between port allocation of envtest suites when go test
+# runs all the tests in parallel (spins up around 10 or so environments).
+#
+# To avoid flakes, set -p=1 to disable parallel go test executions.
+#
+# TODO(community): Investigate this behavior further.
+if [[ "${OSTYPE}" == "darwin"* ]]; then
+  P_FLAG="-p=1"
+fi
+
+go test -race ${P_FLAG} ${MOD_OPT} ./...
 
 if [[ -n ${ARTIFACTS:-} ]]; then
   if grep -Rin '<failure type="Failure">' ${ARTIFACTS}/*; then exit 1; fi