diff --git a/lib/netns.sh b/lib/netns.sh
index 763ccf2..0cd7ddb 100644
--- a/lib/netns.sh
+++ b/lib/netns.sh
@@ -10,7 +10,7 @@ function create_netns {
 function check_netns {
     netns_name="${1}"
 
-    ip netns | grep "${netns_name}" \
+    ip netns | grep "${netns_name}" > /dev/null \
       && return 0 \
       || return 1
 }