diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 815999ecc2..9fe278264b 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -82,7 +82,7 @@ struct DnsPacket {
         bool canonical_form:1;
 };
 
-static inline uint8_t* DNS_PACKET_DATA(DnsPacket *p) {
+static inline uint8_t* DNS_PACKET_DATA(const DnsPacket *p) {
         if (_unlikely_(!p))
                 return NULL;