diff --git a/programs/fileio.c b/programs/fileio.c
index d4aea159..4070fa9c 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -2334,7 +2334,7 @@ FIO_listFile(fileInfo_t* total, const char* inFileName, int displayLevel)
         }
         displayInfo(inFileName, &info, displayLevel);
         *total = FIO_addFInfo(*total, info);
-        assert(error>=0 || error<=1);
+        assert(error == info_success || error == info_frame_error);
         return error;
     }
 }