diff --git a/selftest/resource_test.py b/selftest/resource_test.py
index e4324f6..52d8e47 100755
--- a/selftest/resource_test.py
+++ b/selftest/resource_test.py
@@ -37,7 +37,7 @@
 try:
     resource.solve([ [0, 2],
                      [2],
-                     [0, 2] ]) 
+                     [0, 2] ])
     assert False
 except resource.NotSolvable as e:
     print(e)