diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index a4484b408f..cdae42f3e4 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -497,6 +497,7 @@ TARGET_DEVICES += mikrotik_rb750gr3
 define Device/mikrotik_rbm11g
   $(Device/MikroTik)
   DEVICE_MODEL := RouterBOARD M11G
+  DEFAULT := n # disabled due to unknown port assignment
 endef
 TARGET_DEVICES += mikrotik_rbm11g