diff --git a/mud.c b/mud.c
index 6442c5a..38ccb7e 100644
--- a/mud.c
+++ b/mud.c
@@ -85,8 +85,6 @@
                        CMSG_SPACE(sizeof(struct in6_pktinfo)) + \
                        CMSG_SPACE(sizeof(int)))
 
-#define MUD_PATH_MAX (32U)
-
 struct mud_crypto_opt {
     unsigned char *dst;
     const unsigned char *src;
diff --git a/mud.h b/mud.h
index 119cf57..c214d71 100644
--- a/mud.h
+++ b/mud.h
@@ -4,6 +4,7 @@
 #include <inttypes.h>
 #include <sys/socket.h>
 
+#define MUD_PATH_MAX (32U)
 #define MUD_PUB_SIZE (32U)
 
 struct mud;