diff --git a/linux-user/main.c b/linux-user/main.c
index 6004ece152..3ad70f8a6e 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2030,7 +2030,7 @@ void cpu_loop(CPUPPCState *env)
             /* just indicate that signals should be handled asap */
             break;
         default:
-            cpu_abort(cs, "Unknown exception 0x%d. Aborting\n", trapnr);
+            cpu_abort(cs, "Unknown exception 0x%x. Aborting\n", trapnr);
             break;
         }
         process_pending_signals(env);