diff --git a/ifupdownaddons/iproute2.py b/ifupdownaddons/iproute2.py
index cf15046..04c6900 100644
--- a/ifupdownaddons/iproute2.py
+++ b/ifupdownaddons/iproute2.py
@@ -419,8 +419,9 @@ class iproute2(utilsBase):
         self._cache_update([ifacename, 'hwaddress'], hwaddress)
 
     def link_set_mtu(self, ifacename, mtu):
+        if ifupdownflags.flags.DRYRUN:
+            return True
         if not mtu or not ifacename: return
-
         with open('/sys/class/net/%s/mtu' % ifacename, 'w') as f:
             f.write(mtu)
         self._cache_update([ifacename, 'mtu'], mtu)