diff --git a/pkg/controller/nodeipam/ipam/cidr_allocator.go b/pkg/controller/nodeipam/ipam/cidr_allocator.go
index 0e34c094857..6261672bd61 100644
--- a/pkg/controller/nodeipam/ipam/cidr_allocator.go
+++ b/pkg/controller/nodeipam/ipam/cidr_allocator.go
@@ -75,11 +75,11 @@ const (
 
 	// updateMaxRetries is the max retries for a failed node
 	updateMaxRetries = 10
-
-	// nodePollInterval is used in listing node
-	nodePollInterval = 10 * time.Second
 )
 
+// nodePollInterval is used in listing node
+var nodePollInterval = 10 * time.Second
+
 // CIDRAllocator is an interface implemented by things that know how
 // to allocate/occupy/recycle CIDR for nodes.
 type CIDRAllocator interface {
diff --git a/pkg/controller/nodeipam/ipam/range_allocator_test.go b/pkg/controller/nodeipam/ipam/range_allocator_test.go
index c83567033a7..a5d59483875 100644
--- a/pkg/controller/nodeipam/ipam/range_allocator_test.go
+++ b/pkg/controller/nodeipam/ipam/range_allocator_test.go
@@ -292,6 +292,13 @@ func TestOccupyPreExistingCIDR(t *testing.T) {
 }
 
 func TestAllocateOrOccupyCIDRSuccess(t *testing.T) {
+	// Non-parallel test (overrides global var)
+	oldNodePollInterval := nodePollInterval
+	nodePollInterval = test.NodePollInterval
+	defer func() {
+		nodePollInterval = oldNodePollInterval
+	}()
+
 	// all tests operate on a single node
 	testCases := []testCase{
 		{
@@ -673,6 +680,13 @@ type releaseTestCase struct {
 }
 
 func TestReleaseCIDRSuccess(t *testing.T) {
+	// Non-parallel test (overrides global var)
+	oldNodePollInterval := nodePollInterval
+	nodePollInterval = test.NodePollInterval
+	defer func() {
+		nodePollInterval = oldNodePollInterval
+	}()
+
 	testCases := []releaseTestCase{
 		{
 			description: "Correctly release preallocated CIDR",