diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c
index 743136277d..8e955150fa 100644
--- a/src/nwfilter/nwfilter_dhcpsnoop.c
+++ b/src/nwfilter/nwfilter_dhcpsnoop.c
@@ -195,6 +195,7 @@ struct _virNWFilterSnoopEthHdr {
     uint16_t eh_type;
     uint8_t eh_data[];
 } ATTRIBUTE_PACKED;
+verify(sizeof(struct _virNWFilterSnoopEthHdr) == 14);
 
 typedef struct _virNWFilterSnoopDHCPHdr virNWFilterSnoopDHCPHdr;
 typedef virNWFilterSnoopDHCPHdr *virNWFilterSnoopDHCPHdrPtr;
@@ -216,6 +217,7 @@ struct _virNWFilterSnoopDHCPHdr {
     char      d_file[128];
     uint8_t   d_opts[];
 } ATTRIBUTE_PACKED;
+verify(sizeof(struct _virNWFilterSnoopDHCPHdr) == 236);
 
 /* DHCP options */