diff --git a/src/openvpn/crypto_openssl.c b/src/openvpn/crypto_openssl.c
index ab552efab..ac8287440 100644
--- a/src/openvpn/crypto_openssl.c
+++ b/src/openvpn/crypto_openssl.c
@@ -760,6 +760,9 @@ cipher_kt_mode_cbc(const cipher_kt_t *cipher)
 {
     return cipher && cipher_kt_mode(cipher) == OPENVPN_MODE_CBC
            /* Exclude AEAD cipher modes, they require a different API */
+#ifdef EVP_CIPH_FLAG_CTS
+           && !(EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_CTS)
+#endif
            && !(EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER);
 }