diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 9db9f1c..8981649 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1333,7 +1333,7 @@ _mesa_format_to_type_and_comps(gl_format format,
 
 
    default:
-      _mesa_problem(NULL, "bad format in _mesa_format_to_type_and_comps");
+       _mesa_problem(NULL, "bad format %d in _mesa_format_to_type_and_comps", format);
       *datatype = 0;
       *comps = 1;
    }