--- a/wutils.py	Mon Sep 07 12:11:08 2015 -0700
+++ b/wutils.py	Mon Sep 07 22:52:47 2015 -0700
@@ -90,9 +90,9 @@
 
     if pathvar is not None:
         if pathvar in proc_env:
-            proc_env[pathvar] = os.pathsep.join(list(str(env['NS3_MODULE_PATH'])) + [proc_env[pathvar]])
+            proc_env[pathvar] = os.pathsep.join(list(env['NS3_MODULE_PATH']) + [proc_env[pathvar]])
         else:
-            proc_env[pathvar] = os.pathsep.join(list(str(env['NS3_MODULE_PATH'])))
+            proc_env[pathvar] = os.pathsep.join(list(env['NS3_MODULE_PATH']))
 
     pymoddir = bld.path.find_dir('bindings/python').get_bld().abspath()
     pyvizdir = bld.path.find_dir('src/visualizer').abspath()