diff --git a/src/bpf.c b/src/bpf.c
index c1868a2..b6fbd90 100644
--- a/src/bpf.c
+++ b/src/bpf.c
@@ -20,6 +20,7 @@
 #include <ifaddrs.h>
 
 #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
+#include <sys/param.h>
 #include <sys/sysctl.h>
 #include <net/route.h>
 #include <net/if_dl.h>