diff --git a/scripts/prepare-commit.sh b/scripts/prepare-commit.sh
index 257ee3f7291..dfef1ee6206 100755
--- a/scripts/prepare-commit.sh
+++ b/scripts/prepare-commit.sh
@@ -71,19 +71,13 @@ for f in $MODIFIED; do
 		continue
 		;;
 
-	*.cpp|*.c|*.h|*.cxx|*.hxx|*.c++|*.h++|*.cc|*.hh|*.C|*.H)
+	*.cpp|*.c|*.h|*.cxx|*.hxx|*.c++|*.h++|*.cc|*.hh|*.C|*.H|*.sip)
 		if [ -x "$f" ]; then
 			chmod a-x "$f"
 		fi
 		;;
 
 	*.py)
-		perl -i.prepare -pe "s/[\t ]+$//;" $f
-		if diff -u $f.prepare $f >>$ASTYLEDIFF; then
-			# no difference found
-			rm $f.prepare
-		fi
-		continue
 		;;
 
 	*)