diff --git a/sys/netsmb/smb_usr.c b/sys/netsmb/smb_usr.c
index 9c5f7bb5b64..a1009dbc82d 100644
--- a/sys/netsmb/smb_usr.c
+++ b/sys/netsmb/smb_usr.c
@@ -41,6 +41,7 @@
 #include <sys/socket.h>
 #include <sys/socketvar.h>
 #include <sys/sysctl.h>
+#include <sys/mbuf.h>
 
 #include <sys/iconv.h>