diff --git a/include/nfsc/libnfs.h b/include/nfsc/libnfs.h
index dd71c192..2d14113f 100644
--- a/include/nfsc/libnfs.h
+++ b/include/nfsc/libnfs.h
@@ -386,7 +386,14 @@ EXTERN int nfs_fstat64_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_c
  */
 EXTERN int nfs_fstat64(struct nfs_context *nfs, struct nfsfh *nfsfh, struct nfs_stat_64 *st);
 
-
+/*
+ * UMASK() never blocks, so no special aync/async versions are available
+ */
+/*
+ * Sync umask(<mask>)
+ * Function returns the old mask.
+ */
+EXTERN uint16_t nfs_umask(struct nfs_context *nfs, uint16_t mask);
 
 /*
  * OPEN()
diff --git a/lib/libnfs.c b/lib/libnfs.c
index da5ff64e..8dffe008 100644
--- a/lib/libnfs.c
+++ b/lib/libnfs.c
@@ -125,6 +125,7 @@ struct nfs_context {
        uint64_t writemax;
        char *cwd;
        struct nfsdir *dircache;
+       uint16_t	mask;
 };
 
 void nfs_free_nfsdir(struct nfsdir *nfsdir)
@@ -412,7 +413,7 @@ struct nfs_context *nfs_init_context(void)
 	}
 
 	nfs->cwd = strdup("/");
-
+	nfs->mask = 022;
 	return nfs;
 }
 
@@ -5095,3 +5096,9 @@ const struct nfs_fh3 *nfs_get_rootfh(struct nfs_context *nfs) {
 struct nfs_fh3 *nfs_get_fh(struct nfsfh *nfsfh) {
        return &nfsfh->fh;
 }
+
+uint16_t nfs_umask(struct nfs_context *nfs, uint16_t mask) {
+	 uint16_t tmp = nfs->mask;
+	 nfs->mask = mask;
+	 return tmp;
+}