diff --git a/tools/pyflakes.sh b/tools/pyflakes.sh
index 3ce028ef..795c975c 100755
--- a/tools/pyflakes.sh
+++ b/tools/pyflakes.sh
@@ -2,9 +2,9 @@
 cd $(dirname $0)
 cd ..
 PYFILES=$(git ls-files|grep '^scripts\|\.py$'|grep -v boilerplate_data|tr '\n' ' ')
-grep 'class [^( ]\+:$' ${PYFILES} && exit 3
-grep $'\t\|\s$' $PYFILES && exit 4
-grep '\.setlocale' ${PYFILES} && exit 5
+grep -n 'class [^( ]\+:$' ${PYFILES} && exit 3
+grep -n $'\t\|\s$' $PYFILES && exit 4
+grep -n '\.setlocale' ${PYFILES} && exit 5
 
 FLAKE8=""
 if which flake8 >/dev/null 2>&1; then