Index: head/sys/sys/mman.h
===================================================================
--- head/sys/sys/mman.h
+++ head/sys/sys/mman.h
@@ -254,7 +254,7 @@
 struct file;
 
 struct shmfd {
-	size_t		shm_size;
+	vm_ooffset_t	shm_size;
 	vm_object_t	shm_object;
 	int		shm_refs;
 	uid_t		shm_uid;