diff --git a/waf-tools/ns3.py b/waf-tools/ns3.py
index 5f5595e..04a6e9b 100644
--- a/waf-tools/ns3.py
+++ b/waf-tools/ns3.py
@@ -21,7 +21,7 @@
     # Logs.pprint ('CYAN', '  + %s' % required)
     found = []
     for module in required:
-        retval = conf.check_cfg(package = 'libns3-dev-%s-debug' % module,
+        retval = conf.check_cfg(package = 'libns3-dev-%s-optimized' % module,
                                 args='--cflags --libs', mandatory=mandatory,
                                 msg="Checking for ns3-%s" % module,
                                 uselib_store='NS3_%s' % module.upper())