diff --git a/SConstruct b/SConstruct
index e5d407b..fab9828 100644
--- a/SConstruct
+++ b/SConstruct
@@ -199,7 +199,7 @@
 
 unknown = opts.UnknownVariables()
 if unknown:
-  print 'Warning: Used unknown variables:', ', '.join(unknown.keys())
+  print('Warning: Used unknown variables:', ', '.join(unknown.keys()))
 
 apr = str(env['APR'])
 apu = str(env['APU'])