diff --git a/waflib/Tools/c_config.py b/waflib/Tools/c_config.py
index ea410c85..88f4a7e0 100755
--- a/waflib/Tools/c_config.py
+++ b/waflib/Tools/c_config.py
@@ -386,6 +386,8 @@ def check_cfg(self, *k, **kw):
 		else:
 			self.fatal('The configuration failed')
 	else:
+		if not ret:
+			ret = True
 		kw['success'] = ret
 		if 'okmsg' in kw:
 			self.end_msg(self.ret_msg(kw['okmsg'], kw))