diff --git a/darwin64.py b/darwin64.py
index 20f3e7a500df8125e535cd47408767e5fcc74420..864f8b4e49df062eac09f77999f4b8c74851217e 100644
--- a/darwin64.py
+++ b/darwin64.py
@@ -15,7 +15,7 @@ def config(env,args):
 		env.Append(STANDALONE= '1')
 
 	#env.Append(CXXFLAGS = '-Wall -Woverloaded-virtual -pthread -rdynamic')
-	env.Append(CXXFLAGS = '-Wall -Woverloaded-virtual')
+	env.Append(CXXFLAGS = '-Wall -Woverloaded-virtual -pthread')
 	env.Append(CPPDEFINES = '-DMACVERS')
 
 	cxxversion = env.subst('$CXXVERSION')