diff --git a/p4app/controller.py b/p4app/controller.py
index b7433f9..b1d6c17 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -246,8 +246,13 @@ class L2Controller(object):
 
         # S=1 -> solicitated
         i2 = ICMPv6ND_NA(S=1, tgt=src_addr)
+
+        # Force scapy to recalculate
+        i2.chksum = None
+
         i3 = ICMPv6NDOptSrcLLAddr(lladdr=src_mac)
 
+
         answer = e / i / i2 / i3
         self.send_pkg(answer)