diff --git a/tests/sys/fs/fusefs/mockfs.cc b/tests/sys/fs/fusefs/mockfs.cc
index 2b426a61ffc2..c8fd601397ff 100644
--- a/tests/sys/fs/fusefs/mockfs.cc
+++ b/tests/sys/fs/fusefs/mockfs.cc
@@ -842,8 +842,7 @@ void MockFS::read_request(mockfs_buf_in &in) {
 	 * request,including header, even though fuse_out_header.len excludes
 	 * the size of the header.
 	 */
-	ASSERT_TRUE(res == static_cast<ssize_t>(sizeof(in.header.len)) ||
-		    m_quit);
+	ASSERT_TRUE(res == static_cast<ssize_t>(in.header.len) || m_quit);
 }
 
 void MockFS::write_response(const mockfs_buf_out &out) {