diff --git a/src/ecdh_crypto.c b/src/ecdh_crypto.c
index 10c0bcd7..a1de27fd 100644
--- a/src/ecdh_crypto.c
+++ b/src/ecdh_crypto.c
@@ -101,7 +101,7 @@ int ssh_client_ecdh_init(ssh_session session){
   rc = ssh_buffer_add_ssh_string(session->out_buffer,client_pubkey);
   if (rc < 0) {
       EC_KEY_free(key);
-      ssh_string_free(client_pubkey);
+      SSH_STRING_FREE(client_pubkey);
       return SSH_ERROR;
   }
 
@@ -298,7 +298,7 @@ SSH_PACKET_CALLBACK(ssh_packet_server_ecdh_init){
     rc = ssh_dh_get_next_server_publickey_blob(session, &pubkey_blob);
     if (rc != SSH_OK) {
         ssh_set_error(session, SSH_FATAL, "Could not export server public key");
-        ssh_string_free(sig_blob);
+        SSH_STRING_FREE(sig_blob);
         return SSH_ERROR;
     }
 
@@ -309,8 +309,8 @@ SSH_PACKET_CALLBACK(ssh_packet_server_ecdh_init){
                          q_s_string, /* ecdh public key */
                          sig_blob); /* signature blob */
 
-    ssh_string_free(sig_blob);
-    ssh_string_free(pubkey_blob);
+    SSH_STRING_FREE(sig_blob);
+    SSH_STRING_FREE(pubkey_blob);
 
     if (rc != SSH_OK) {
         ssh_set_error_oom(session);