diff --git a/root/etc/s6-overlay/s6-rc.d/init-wireguard-module/run b/root/etc/s6-overlay/s6-rc.d/init-wireguard-module/run
index 3d1e8aa..a838519 100755
--- a/root/etc/s6-overlay/s6-rc.d/init-wireguard-module/run
+++ b/root/etc/s6-overlay/s6-rc.d/init-wireguard-module/run
@@ -8,7 +8,7 @@ ip link del dev test 2>/dev/null
 if ip link add dev test type wireguard; then
     echo "**** It seems the wireguard module is already active. Skipping kernel header install and module compilation. ****"
     ip link del dev test
-    if capsh --print | grep -qv '\!cap_sys_module'; then
+    if capsh --current | grep "Current:" | grep "cap_sys_module"; then
         echo "**** As the wireguard module is already active you can remove the SYS_MODULE capability from your container run/compose. ****"
     fi
 else