diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 3713d22b95a70..907e85d65bb4e 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -174,7 +174,7 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
 
 		cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
 		memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
-		full_path[dfsplen] = '\\';
+		full_path[dfsplen] = dirsep;
 		for (i = 0; i < pplen-1; i++)
 			if (full_path[dfsplen+1+i] == '/')
 				full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);