diff --git a/run-tests.sh b/run-tests.sh
index 2227da547..cd23a2529 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -1,2 +1,9 @@
 #!/bin/sh
-git grep -l doctest Lib/ | PYTHONPATH="Lib:$PYTHONPATH" xargs -n1 python
+PYTHONPATH="Lib:$PYTHONPATH"
+export PYTHONPATH
+ret=0
+git grep -l doctest Lib/ | while read test; do
+	echo "Running tests in $test"
+	python $test || let ret=ret+1
+done
+exit $ret