diff --git a/runtests.sh b/runtests.sh
index 15fa202..f36f5cf 100755
--- a/runtests.sh
+++ b/runtests.sh
@@ -4,4 +4,4 @@
 # If you are getting an INVOCATION ERROR for this script then there is 
 # a good chance you are running on Windows.
 # You can and should use WSL for running tox on Windows when it calls bash scripts.
-REQUESTS_CA_BUNDLE=`python -m pytest_httpbin.certs` pytest $*
+REQUESTS_CA_BUNDLE=`python -m pytest_httpbin.certs` exec pytest "$@"