diff --git a/drbg/ctr_drbg_test.go b/drbg/ctr_drbg_test.go
index 90faeb2..6447891 100644
--- a/drbg/ctr_drbg_test.go
+++ b/drbg/ctr_drbg_test.go
@@ -308,7 +308,7 @@ func TestGmCtrDRBG_Validation(t *testing.T) {
 func TestCtrDrbg_Destroy(t *testing.T) {
 	entropyInput := make([]byte, 64)
 	_, _ = rand.Reader.Read(entropyInput)
-	cd, err := NewCtrDrbg(sm4.NewCipher, 16, SECURITY_LEVEL_ONE, true, entropyInput[:16], entropyInput[16:24], nil)
+	cd, err := NewCtrDrbg(sm4.NewCipher, 16, SECURITY_LEVEL_ONE, true, entropyInput[:32], entropyInput[32:64], nil)
 	if err != nil {
 		t.Errorf("NewCtrDrbg failed: %v", err)
 	}