diff --git a/repertory/repertory_test/src/fuse_drive_rdrw_test.cpp b/repertory/repertory_test/src/fuse_drive_rdrw_test.cpp
index e25d42b5..9b7bbc63 100644
--- a/repertory/repertory_test/src/fuse_drive_rdrw_test.cpp
+++ b/repertory/repertory_test/src/fuse_drive_rdrw_test.cpp
@@ -185,7 +185,7 @@ TYPED_TEST(fuse_test, rdrw_can_append_to_file) {
   handle = open(file_path.c_str(), O_WRONLY | O_APPEND);
   ASSERT_GT(handle, -1);
   bytes_written = write(handle, "cow_", 4U);
-  EXPECT_EQ(3U, bytes_written);
+  EXPECT_EQ(4U, bytes_written);
   close(handle);
 
   handle = open(file_path.c_str(), O_WRONLY | O_APPEND);