diff --git a/configure.ac b/configure.ac
index b10ab8a..c91d844 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,19 +80,24 @@ AC_CHECK_FUNCS([ \
 AC_SEARCH_LIBS([clock_nanosleep], [rt])
 
 AC_CHECK_DECL(SO_RXQ_OVFL,,
-    [AC_DEFINE([SO_RXQ_OVFL], [40], [SO_RXQ_OVFL])]
+    [AC_DEFINE([SO_RXQ_OVFL], [40], [SO_RXQ_OVFL])],
+    [[#include <linux/net.h>]]
 )
 AC_CHECK_DECL(PF_CAN,,
-    [AC_DEFINE([PF_CAN], [29], [PF_CAN])]
+    [AC_DEFINE([PF_CAN], [29], [PF_CAN])],
+    [[#include <net/if.h>]]
 )
 AC_CHECK_DECL(AF_CAN,,
-    [AC_DEFINE([AF_CAN], [PF_CAN], [AF_CAN])]
+    [AC_DEFINE([AF_CAN], [PF_CAN], [AF_CAN])],
+    [[#include <net/if.h>]]
 )
 AC_CHECK_DECL(N_SLCAN,,
-    [AC_DEFINE([N_SLCAN], [17], [N_SLCAN])]
+    [AC_DEFINE([N_SLCAN], [17], [N_SLCAN])],
+    [[#include <linux/tty.h>]]
 )
 AC_CHECK_DECL(SCM_TIMESTAMPING_OPT_STATS,,
-    [AC_DEFINE([SCM_TIMESTAMPING_OPT_STATS], [54], [SCM_TIMESTAMPING_OPT_STATS])]
+    [AC_DEFINE([SCM_TIMESTAMPING_OPT_STATS], [54], [SCM_TIMESTAMPING_OPT_STATS])],
+    [[#include <linux/net.h>]]
 )