diff --git a/master.cfg b/master.cfg
index cf1c735..59b6687 100644
--- a/master.cfg
+++ b/master.cfg
@@ -792,7 +792,7 @@ class RunTestGDBAIX_Common (BuildAndTestGDBFactory):
         self.extra_make_flags = [ 'MAKEINFO=true' ]
         BuildAndTestGDBFactory.__init__ (self, **kwargs)
 
-class RunTestGDBPlainAIX (RunTestGDBPlain_c64t64, RunTestGDBAIX_Common):
+class RunTestGDBPlainAIX (RunTestGDBAIX_Common, RunTestGDBPlain_c64t64):
     """Compiling for AIX"""
     pass