diff --git a/plugins/nginx-vhosts/functions b/plugins/nginx-vhosts/functions
index 11dba3d0a..6e4a0769b 100755
--- a/plugins/nginx-vhosts/functions
+++ b/plugins/nginx-vhosts/functions
@@ -267,7 +267,7 @@ nginx_build_config() {
     # echo "sigil ${SIGIL_PARAMS[@]}"
     sigil "${SIGIL_PARAMS[@]}" | cat -s > "$NGINX_CONF"
 
-    if is_deployed "$APP"; then
+    if (is_deployed "$APP"); then
       dokku_log_info1 "Creating $SCHEME nginx.conf"
       mv "$NGINX_CONF" "$DOKKU_ROOT/$APP/nginx.conf"
     else
@@ -275,7 +275,7 @@ nginx_build_config() {
       rm -f "$NGINX_CONF"
     fi
 
-    if is_deployed "$APP"; then
+    if (is_deployed "$APP"); then
       dokku_log_info1 "Running nginx-pre-reload"
       plugn trigger nginx-pre-reload "$APP" "$DOKKU_APP_LISTEN_PORT" "$DOKKU_APP_LISTEN_IP"
 
@@ -294,7 +294,7 @@ nginx_build_config() {
       dokku_log_info1 "deleting nginx.conf"
       rm "$DOKKU_ROOT/$APP/nginx.conf"
 
-      if is_deployed "$APP"; then
+      if (is_deployed "$APP"); then
         dokku_log_info1 "reloading nginx after nginx.conf deletion"
         validate_nginx && restart_nginx
       fi
diff --git a/plugins/ps/functions b/plugins/ps/functions
index 5a9949431..0e3bda1ee 100755
--- a/plugins/ps/functions
+++ b/plugins/ps/functions
@@ -135,7 +135,7 @@ ps_restart() {
   local APP="$1"; verify_app_name "$APP"
   local IMAGE_TAG=$(get_running_image_tag "$APP")
 
-  if is_deployed "$APP"; then
+  if (is_deployed "$APP"); then
     release_and_deploy "$APP" "$IMAGE_TAG"
   else
     echo "App $APP has not been deployed"
diff --git a/plugins/ps/subcommands/rebuildall b/plugins/ps/subcommands/rebuildall
index 7a903b3f0..06eff9311 100755
--- a/plugins/ps/subcommands/rebuildall
+++ b/plugins/ps/subcommands/rebuildall
@@ -7,7 +7,7 @@ ps_rebuildall_cmd() {
   declare desc="rebuilds all deployed apps via command line"
   local cmd="ps:rebuildall"
   for app in $(dokku_apps); do
-    is_deployed "$app" && ps_rebuild "$app"
+    (is_deployed "$app") && ps_rebuild "$app"
   done
 }