diff --git a/cr-check.c b/cr-check.c
index 9afc9e83d..c31799871 100644
--- a/cr-check.c
+++ b/cr-check.c
@@ -94,10 +94,6 @@ static int check_map_files(void)
 	return -1;
 }
 
-#ifndef NETLINK_SOCK_DIAG
-#define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
-#endif
-
 static int check_sock_diag(void)
 {
 	int ret;
diff --git a/include/sockets.h b/include/sockets.h
index 1acb64368..a3010e1d0 100644
--- a/include/sockets.h
+++ b/include/sockets.h
@@ -83,4 +83,8 @@ static inline int sk_decode_shutdown(int val)
 
 #define USK_EXT_PARAM "ext-unix-sk"
 
+#ifndef NETLINK_SOCK_DIAG
+#define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
+#endif
+
 #endif /* __CR_SOCKETS_H__ */
diff --git a/net.c b/net.c
index 015aeda90..ad314dfa5 100644
--- a/net.c
+++ b/net.c
@@ -26,10 +26,6 @@
 #include "protobuf.h"
 #include "protobuf/netdev.pb-c.h"
 
-#ifndef NETLINK_SOCK_DIAG
-#define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
-#endif
-
 static int ns_fd = -1;
 static int ns_sysfs_fd = -1;