diff --git a/libports/src/test/libc_ffat/main.cc b/libports/src/test/libc_ffat/main.cc
index fa9175920..9f7d43360 100644
--- a/libports/src/test/libc_ffat/main.cc
+++ b/libports/src/test/libc_ffat/main.cc
@@ -43,6 +43,7 @@ int main(int argc, char *argv[])
 	ssize_t count;
 
 	char const *dir_name      = "/testdir";
+	char const *dir_name2     = "testdir2";
 	char const *file_name     = "test.tst";
 	char const *file_name2    = "test2.tst";
 	char const *file_name3    = "test3.tst";
@@ -64,6 +65,9 @@ int main(int argc, char *argv[])
 		/* change to new directory */
 		CALL_AND_CHECK(ret, chdir(dir_name), ret == 0, "dir_name=%s", dir_name);
 
+		/* create subdirectory with relative path */
+		CALL_AND_CHECK(ret, mkdir(dir_name2, 0777), ((ret == 0) || (errno == EEXIST)), "dir_name=%s", dir_name2);
+
 		/* write pattern to a file */
 		CALL_AND_CHECK(fd, open(file_name, O_CREAT | O_WRONLY), fd >= 0, "file_name=%s", file_name);
 		CALL_AND_CHECK(count, write(fd, pattern, pattern_size), (size_t)count == pattern_size, "");
diff --git a/os/src/server/ram_fs/directory.h b/os/src/server/ram_fs/directory.h
index 7617bcfa5..592edcbfd 100644
--- a/os/src/server/ram_fs/directory.h
+++ b/os/src/server/ram_fs/directory.h
@@ -114,7 +114,7 @@ namespace File_system {
 				if (!sub_dir)
 					throw Lookup_failed();
 
-				return sub_dir->lookup_and_lock(path + i + 1);
+				return sub_dir->lookup_and_lock(path + i + 1, return_parent);
 			}
 
 			Directory *lookup_and_lock_dir(char const *path)