diff --git a/src/quic.c b/src/quic.c
index 0c902f422..c5e607287 100644
--- a/src/quic.c
+++ b/src/quic.c
@@ -1038,11 +1038,17 @@ const WOLFSSL_EVP_CIPHER* wolfSSL_quic_get_hp(WOLFSSL* ssl)
 
     switch (cipher->cipherSuite) {
 #if !defined(NO_AES) && defined(HAVE_AESGCM)
+        /* This has to be CTR even though the spec says that ECB is used for
+         * mask generation. ngtcp2_crypto_hp_mask uses a hack where they pass
+         * in the "ECB" input as the IV for the CTR cipher and then the input
+         * is just a cleared buffer. They do this so that the EVP
+         * init-update-final cycle can be used without the padding that is added
+         * for EVP_aes_(128|256)_ecb. */
         case TLS_AES_128_GCM_SHA256:
-            evp_cipher = wolfSSL_EVP_aes_128_gcm();
+            evp_cipher = wolfSSL_EVP_aes_128_ctr();
             break;
         case TLS_AES_256_GCM_SHA384:
-            evp_cipher = wolfSSL_EVP_aes_256_gcm();
+            evp_cipher = wolfSSL_EVP_aes_256_ctr();
             break;
 #endif
 #if defined(HAVE_CHACHA) && defined(HAVE_POLY1305)
@@ -1051,8 +1057,9 @@ const WOLFSSL_EVP_CIPHER* wolfSSL_quic_get_hp(WOLFSSL* ssl)
             break;
 #endif
 #if !defined(NO_AES) && defined(HAVE_AESCCM) && defined(WOLFSSL_AES_128)
+        /* This has to be CTR. See comment above. */
         case TLS_AES_128_CCM_SHA256:
-            evp_cipher = wolfSSL_EVP_aes_128_ccm();
+            evp_cipher = wolfSSL_EVP_aes_128_ctr();
             break;
         case TLS_AES_128_CCM_8_SHA256:
             WOLFSSL_MSG("wolfSSL_quic_get_hp: no CCM-8 support in EVP layer");