diff --git a/src/session.c b/src/session.c
index 6a5b1328..f32d1627 100644
--- a/src/session.c
+++ b/src/session.c
@@ -451,8 +451,12 @@ const char* ssh_get_kex_algo(ssh_session session) {
         return "curve25519-sha256@libssh.org";
     case SSH_KEX_SNTRUP761X25519_SHA512_OPENSSH_COM:
         return "sntrup761x25519-sha512@openssh.com";
-    default:
-        break;
+#ifdef WITH_GEX
+    case SSH_KEX_DH_GEX_SHA1:
+        return "diffie-hellman-group-exchange-sha1";
+    case SSH_KEX_DH_GEX_SHA256:
+        return "diffie-hellman-group-exchange-sha256";
+#endif /* WITH_GEX */
     }
 
     return NULL;