diff --git a/master.cfg b/master.cfg
index fd17c31..1a32e66 100644
--- a/master.cfg
+++ b/master.cfg
@@ -1288,7 +1288,7 @@ class RunTestGDBSolaris_Common (BuildAndTestGDBFactory):
         self.extra_CFLAGS = [ '-O' ]
         self.extra_CXXFLAGS = [ '-O' ]
 
-class RunTestGDBPlainSolaris_c64 (RunTestGDBSolaris_Common):
+class RunTestGDBPlainSolaris_c64 (BuildAndTestGDBFactory, RunTestGDBSolaris_Common):
     """Compiling for Solaris"""
     def __init__ (self, **kwargs):
         self.extra_CFLAGS += [ '-m64' ]