diff --git a/python-MultipartPostHandler2.spec b/python-MultipartPostHandler2.spec
index 4c9997e..c8fa998 100644
--- a/python-MultipartPostHandler2.spec
+++ b/python-MultipartPostHandler2.spec
@@ -41,7 +41,7 @@ Enables the use of multipart/form-data for posting forms.
 %setup -q -n %{pypi_name}-%{version}
 rm -rf doc # no real doc there
 
-find . -name '*.py' | xargs sed -i '1s|^#!%{__python}|#!%{__python3}|'
+%py3_shebang_fix .
 2to3 --write --nobackup *.py examples/*.py
 %patch1 -p1