diff --git a/.changelog/40601.txt b/.changelog/40601.txt
new file mode 100644
index 00000000000..bff9ae86519
--- /dev/null
+++ b/.changelog/40601.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_rds_cluster: Fix issue with waiter when modifying `allocated_storage`
+```
\ No newline at end of file
diff --git a/internal/service/rds/cluster.go b/internal/service/rds/cluster.go
index fd93671c274..11ace2a5d15 100644
--- a/internal/service/rds/cluster.go
+++ b/internal/service/rds/cluster.go
@@ -2050,6 +2050,7 @@ func waitDBClusterUpdated(ctx context.Context, conn *rds.Client, id string, wait
 		clusterStatusRenaming,
 		clusterStatusResettingMasterCredentials,
 		clusterStatusScalingCompute,
+		clusterStatusScalingStorage,
 		clusterStatusUpgrading,
 	}
 	if waitNoPendingModifiedValues {
diff --git a/internal/service/rds/cluster_test.go b/internal/service/rds/cluster_test.go
index d17a56a207d..4b56ab0d4a9 100644
--- a/internal/service/rds/cluster_test.go
+++ b/internal/service/rds/cluster_test.go
@@ -729,7 +729,7 @@ func TestAccRDSCluster_storageTypeAuroraUpdateAuroraIopt1(t *testing.T) {
 	})
 }
 
-func TestAccRDSCluster_allocatedStorage(t *testing.T) {
+func TestAccRDSCluster_allocatedStorage_io1(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping long-running test in short mode")
 	}
@@ -746,7 +746,7 @@ func TestAccRDSCluster_allocatedStorage(t *testing.T) {
 		CheckDestroy:             testAccCheckClusterDestroy(ctx),
 		Steps: []resource.TestStep{
 			{
-				Config: testAccClusterConfig_allocatedStorage(rName),
+				Config: testAccClusterConfig_allocatedStorage(rName, "io1", 100, 1000),
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckClusterExists(ctx, resourceName, &dbCluster),
 					resource.TestCheckResourceAttr(resourceName, names.AttrAllocatedStorage, "100"),
@@ -756,6 +756,40 @@ func TestAccRDSCluster_allocatedStorage(t *testing.T) {
 	})
 }
 
+func TestAccRDSCluster_allocatedStorage_gp3(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping long-running test in short mode")
+	}
+
+	ctx := acctest.Context(t)
+	var dbCluster types.DBCluster
+	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
+	resourceName := "aws_rds_cluster.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.PreCheck(ctx, t) },
+		ErrorCheck:               acctest.ErrorCheck(t, names.RDSServiceID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		CheckDestroy:             testAccCheckClusterDestroy(ctx),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccClusterConfig_allocatedStorage(rName, "gp3", 400, 12000),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckClusterExists(ctx, resourceName, &dbCluster),
+					resource.TestCheckResourceAttr(resourceName, names.AttrAllocatedStorage, "400"),
+				),
+			},
+			{
+				Config: testAccClusterConfig_allocatedStorage(rName, "gp3", 500, 12000),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckClusterExists(ctx, resourceName, &dbCluster),
+					resource.TestCheckResourceAttr(resourceName, names.AttrAllocatedStorage, "500"),
+				),
+			},
+		},
+	})
+}
+
 // Verify storage_type from aurora-iopt1 to aurora
 func TestAccRDSCluster_storageTypeAuroraIopt1UpdateAurora(t *testing.T) {
 	if testing.Short() {
@@ -3669,7 +3703,7 @@ resource "aws_db_instance" "test" {
 `, tfrds.ClusterEnginePostgres, mainInstanceClasses, rName, sType))
 }
 
-func testAccClusterConfig_allocatedStorage(rName string) string {
+func testAccClusterConfig_allocatedStorage(rName, storageType string, allocatedStorage, iops int) string {
 	return acctest.ConfigCompose(
 		testAccConfig_ClusterSubnetGroup(rName),
 		fmt.Sprintf(`
@@ -3677,7 +3711,7 @@ data "aws_rds_orderable_db_instance" "test" {
   engine                     = %[1]q
   engine_latest_version      = true
   preferred_instance_classes = [%[2]s]
-  storage_type               = "io1"
+  storage_type               = %[4]q
   supports_iops              = true
   supports_clusters          = true
 }
@@ -3690,13 +3724,13 @@ resource "aws_rds_cluster" "test" {
   engine                    = data.aws_rds_orderable_db_instance.test.engine
   engine_version            = data.aws_rds_orderable_db_instance.test.engine_version
   storage_type              = data.aws_rds_orderable_db_instance.test.storage_type
-  allocated_storage         = 100
-  iops                      = 1000
+  allocated_storage         = %[5]d
+  iops                      = %[6]d
   master_password           = "mustbeeightcharaters"
   master_username           = "test"
   skip_final_snapshot       = true
 }
-`, tfrds.ClusterEngineMySQL, mainInstanceClasses, rName))
+`, tfrds.ClusterEngineMySQL, mainInstanceClasses, rName, storageType, allocatedStorage, iops))
 }
 
 func testAccClusterConfig_iops(rName string) string {
diff --git a/internal/service/rds/consts.go b/internal/service/rds/consts.go
index 9fdd7c5e0ea..1393f9dc42f 100644
--- a/internal/service/rds/consts.go
+++ b/internal/service/rds/consts.go
@@ -30,6 +30,7 @@ const (
 	clusterStatusRenaming                      = "renaming"
 	clusterStatusResettingMasterCredentials    = "resetting-master-credentials"
 	clusterStatusScalingCompute                = "scaling-compute"
+	clusterStatusScalingStorage                = "scaling-storage"
 	clusterStatusUpgrading                     = "upgrading"
 
 	// Non-standard status values.