diff --git a/P4D2_2017_Fall/exercises/mri/solution/mri.p4 b/P4D2_2017_Fall/exercises/mri/solution/mri.p4
index 1ce23be..654f01b 100644
--- a/P4D2_2017_Fall/exercises/mri/solution/mri.p4
+++ b/P4D2_2017_Fall/exercises/mri/solution/mri.p4
@@ -198,6 +198,7 @@ control MyEgress(inout headers hdr,
 
         hdr.ipv4.ihl = hdr.ipv4.ihl + 2;
         hdr.ipv4_option.optionLength = hdr.ipv4_option.optionLength + 8; 
+	hdr.ipv4.totalLen = hdr.ipv4.totalLen + 8;
     }
 
     table swtrace {