diff --git a/python-pyserial.spec b/python-pyserial.spec
index 581a138..d2efb68 100644
--- a/python-pyserial.spec
+++ b/python-pyserial.spec
@@ -50,15 +50,13 @@ Documentation, examples, and help files for %{name}.
 
 %prep
 %setup -q -n pyserial-%{version}
-sed -i "s|^#\!\/usr\/bin\/env python$||" serial/{serialposix,__init__}.py # Fix non-executable scripts
-sed -i "s/\r//" examples/port_publisher.py # Fix EOL encoding
-find examples -name '*.py' -exec sed -i "s|^#!%{_bindir}/env python$|#!python3|" {} \;
-find examples -name '*.py' -exec sed -i "s|^#! %{_bindir}/env python$|#!python3|" {} \;
-find examples -name '*.py' -exec sed -i "s|^#! python$|#!python3|" {} \;
+sed -i "s|^#!\/usr\/bin\/env python$||" serial/{serialposix,__init__}.py # Fix non-executable scripts
+sed -i -e "s/\r//" examples/port_publisher.py # Fix EOL encoding
 
 %build
 %python_build
 make %{?_smp_mflags} -C documentation html && rm documentation/_build/html/.buildinfo # Build HTML documentation
+sed -i -e "1{s|^#![[:spaces:]]*\/.*bin.*$|#!%{_bindir}/python3|}" examples/*.py
 
 %install
 %python_install