diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h
index df1f770..595f061 100644
--- a/include/fuse_lowlevel.h
+++ b/include/fuse_lowlevel.h
@@ -88,7 +88,7 @@ struct fuse_entry_param {
 	 * it as an error.
 	 *
 	 */
-	unsigned long generation;
+	uint64_t generation;
 
 	/** Inode attributes.
 	 *
@@ -233,7 +233,7 @@ struct fuse_lowlevel_ops {
 	 * @param ino the inode number
 	 * @param nlookup the number of lookups to forget
 	 */
-	void (*forget) (fuse_req_t req, fuse_ino_t ino, unsigned long nlookup);
+	void (*forget) (fuse_req_t req, fuse_ino_t ino, uint64_t nlookup);
 
 	/**
 	 * Get file attributes
diff --git a/lib/fuse.c b/lib/fuse.c
index ea96892..e4031c7 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -2529,8 +2529,7 @@ static void do_forget(struct fuse *f, fuse_ino_t ino, uint64_t nlookup)
 	forget_node(f, ino, nlookup);
 }
 
-static void fuse_lib_forget(fuse_req_t req, fuse_ino_t ino,
-			    unsigned long nlookup)
+static void fuse_lib_forget(fuse_req_t req, fuse_ino_t ino, uint64_t nlookup)
 {
 	do_forget(req_fuse(req), ino, nlookup);
 	fuse_reply_none(req);