diff --git a/src/protocols/rdp/client.c b/src/protocols/rdp/client.c
index 9b62ef58..29773fc5 100644
--- a/src/protocols/rdp/client.c
+++ b/src/protocols/rdp/client.c
@@ -468,11 +468,17 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
     }
 
     /* ANY security (allow server to choose) */
-    else {
+    else if (strcmp(argv[IDX_SECURITY], "any") == 0) {
         guac_client_log_info(client, "Security mode: ANY");
         settings->security_mode = GUAC_SECURITY_ANY;
     }
 
+    /* If nothing given, default to RDP */
+    else {
+        guac_client_log_info(client, "No security mode specified. Defaulting to RDP.");
+        settings->security_mode = GUAC_SECURITY_RDP;
+    }
+
     /* Set hostname */
     settings->hostname = strdup(argv[IDX_HOSTNAME]);