diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index bca1d70e1a..5627447953 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -2275,7 +2275,7 @@ void helper_pmon (int function)
         break;
     case 158:
         {
-            unsigned char *fmt = (void *)(unsigned long)env->active_tc.gpr[4];
+            unsigned char *fmt = (void *)(uintptr_t)env->active_tc.gpr[4];
             printf("%s", fmt);
         }
         break;