diff --git a/felix/dataplane/linux/bpf_ep_mgr_test.go b/felix/dataplane/linux/bpf_ep_mgr_test.go
index 29d2ba69f1b..00dd2e26154 100644
--- a/felix/dataplane/linux/bpf_ep_mgr_test.go
+++ b/felix/dataplane/linux/bpf_ep_mgr_test.go
@@ -114,6 +114,9 @@ func (m *mockDataplane) loadDefaultPolicies() error {
 }
 
 func (m *mockDataplane) ensureProgramAttached(ap attachPoint) (qDiscInfo, error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
 	var qdisc qDiscInfo
 	key := ap.IfaceName() + ":" + ap.HookName().String()
 	m.numAttaches[key] = m.numAttaches[key] + 1