diff --git a/gns3-qemu.json b/gns3-qemu.json
index 5aa4f43..81869f4 100644
--- a/gns3-qemu.json
+++ b/gns3-qemu.json
@@ -1,6 +1,6 @@
 {
   "variables": {
-    "iso_mirror": "http://ftp.agdsn.de/pub/mirrors",
+    "iso_mirror": "ftp.agdsn.de/pub/mirrors",
     "opennms_release": "stable",
     "onms-version": "22.0.0-1"
   },
diff --git a/gns3-vmware.json b/gns3-vmware.json
index d9ff03a..de82ce0 100644
--- a/gns3-vmware.json
+++ b/gns3-vmware.json
@@ -1,6 +1,6 @@
 {
   "variables": {
-    "iso_mirror": "http://ftp.agdsn.de/pub/mirrors",
+    "iso_mirror": "ftp.agdsn.de/pub/mirrors",
     "opennms_release": "stable",
     "onms-version": "22.0.0-1"
   },