diff --git a/python-pyserial.spec b/python-pyserial.spec
index d2efb68..c6bb27d 100644
--- a/python-pyserial.spec
+++ b/python-pyserial.spec
@@ -56,7 +56,7 @@ 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.*$|#!%{_bindir}/python3|}" examples/*.py
+sed -i -e "1{s|^#![[:space:]]*\/.*bin.*$|#!%{_bindir}/python3|}" examples/*.py
 
 %install
 %python_install