diff --git a/master.cfg b/master.cfg
index 61c7602..08bb500 100644
--- a/master.cfg
+++ b/master.cfg
@@ -305,7 +305,7 @@ buildslave."""
                         WithProperties (r"-j%s", r'jobs'),
                         'all'] + extra_make_flags
 
-class TestGDB (Compile):
+class TestGDB (ShellCommand):
     """This build step runs the full testsuite for GDB.  It can run in
 parallel mode (see BuildAndTestGDBFactory below), and it will also
 provide any extra flags for "make" if needed.  Unfortunately, because