diff --git a/apps/nginx-proxy-manager/install.sh b/apps/nginx-proxy-manager/install.sh
index e3802f7..8f18cd1 100644
--- a/apps/nginx-proxy-manager/install.sh
+++ b/apps/nginx-proxy-manager/install.sh
@@ -20,10 +20,9 @@ pms_settraps
 
 if [ $EPS_CT_INSTALL = false ]; then
   pms_header
+  pms_check_os
 fi
 
-pms_check_os
-
 EPS_OS_ARCH=$(os_arch)
 EPS_OS_CODENAME=$(os_codename)
 EPS_OS_VERSION=${EPS_OS_VERSION:-$(os_version)}