diff --git a/client/hardnested/hardnested_bruteforce.c b/client/hardnested/hardnested_bruteforce.c
index 98f2785b2..4c820cbc1 100644
--- a/client/hardnested/hardnested_bruteforce.c
+++ b/client/hardnested/hardnested_bruteforce.c
@@ -172,7 +172,7 @@ crack_states_thread(void* x){
 				char progress_text[80];
 				char keystr[18];
 				sprintf(keystr, "%012" PRIx64, key);
-				sprintf(progress_text, "Brute force phase completed. Key found: " _GREEN_(keystr));
+				sprintf(progress_text, "Brute force phase completed. Key found: " _GREEN_(%s), keystr);
 				hardnested_print_progress(thread_arg->num_acquired_nonces, progress_text, 0.0, 0);				
                 break;
             } else if(keys_found){