diff --git a/test/e2e/storage/regional_pd.go b/test/e2e/storage/regional_pd.go
index e4eb7b6b34d..baf0dd77989 100644
--- a/test/e2e/storage/regional_pd.go
+++ b/test/e2e/storage/regional_pd.go
@@ -99,8 +99,8 @@ func testVolumeProvisioning(c clientset.Interface, ns string) {
 				"zones":            strings.Join(cloudZones, ","),
 				"replication-type": "regional-pd",
 			},
-			claimSize:    "1.5G",
-			expectedSize: "2G",
+			claimSize:    "1.5Gi",
+			expectedSize: "2Gi",
 			pvCheck: func(volume *v1.PersistentVolume) error {
 				err := checkGCEPD(volume, "pd-standard")
 				if err != nil {
@@ -117,8 +117,8 @@ func testVolumeProvisioning(c clientset.Interface, ns string) {
 				"type":             "pd-standard",
 				"replication-type": "regional-pd",
 			},
-			claimSize:    "1.5G",
-			expectedSize: "2G",
+			claimSize:    "1.5Gi",
+			expectedSize: "2Gi",
 			pvCheck: func(volume *v1.PersistentVolume) error {
 				err := checkGCEPD(volume, "pd-standard")
 				if err != nil {