diff --git a/test/test_helper.bash b/test/test_helper.bash
index 9358619..d498f93 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -12,7 +12,7 @@ check_certificates()
 # https://unix.stackexchange.com/questions/285924/how-to-compare-a-programs-version-in-a-shell-script
 check_nginx() {
     requiredver="1.11.0"
-    currentver="$(nginx -v)"
+    currentver=$(nginx -v 2>&1)
     if [ "$(printf '%s\n' "$requiredver" "$currentver" | sort -V | head -n1)" = "$requiredver" ]; then
         export OLD_NGINX="false"
     else