diff --git a/setup/extensions.py b/setup/extensions.py
index 586c43fe7a..c0132d7359 100644
--- a/setup/extensions.py
+++ b/setup/extensions.py
@@ -368,7 +368,7 @@ class Build(Command):
         self.info('\n####### Building calibre style', '#'*7)
         sdir = self.j(self.SRC, 'qtcurve')
         def path(x):
-            if x: x=self.j(sdir, x)
+            x=self.j(sdir, x)
             return ('"%s"'%x).replace(os.sep, '/')
         headers = [
            "common/colorutils.h",