diff --git a/modules/upgrade_dist.sh b/modules/upgrade_dist.sh
index 3438b69..2f8fcba 100644
--- a/modules/upgrade_dist.sh
+++ b/modules/upgrade_dist.sh
@@ -44,7 +44,7 @@ upgrade_dist()
         fi
         echo "# Generated automatically on $(stdtime) by $0" > $proxyfile
         echo "Acquire::http::Proxy \"http://${PROXY_APT}:${PROXY_APT_PORT}\";" >> $proxyfile
-    elif [[ -n $http_proxy ]]; then
+    elif [[ -n $PROXY_SRV ]]; then
         echo "# Generated automatically on $(stdtime) by $0" > $proxyfile
         echo "Acquire::http::Proxy \"http://${PROXY_SRV}:${PROXY_SRV_PORT}\";" >> $proxyfile
     else