diff --git a/tdutils/test/filesystem.cpp b/tdutils/test/filesystem.cpp
index 179987b0f..de2def1e5 100644
--- a/tdutils/test/filesystem.cpp
+++ b/tdutils/test/filesystem.cpp
@@ -24,24 +24,24 @@ TEST(Misc, clean_filename) {
   test_clean_filename("!@#$%^&*()_+-=[]{;|:\"}'<>?,.`~", "!@#$%^  ()_+-=[]{;   }    ,.~");
   test_clean_filename("!@#$%^&*()_+-=[]{}\\|:\";'<>?,.`~", ";    ,.~");
   test_clean_filename("عرفها بعد قد. هذا مع تاريخ اليميني واندونيسيا،, لعدم تاريخ لهيمنة الى",
-                      "عرفها بعد قد.هذا مع تاريخ اليميني");
+                      "عرفها بعد قد.هذا مع تاريخ الي");
   test_clean_filename(
       "012345678901234567890123456789012345678901234567890123456789adsasdasdsaa.01234567890123456789asdasdasdasd",
-      "012345678901234567890123456789012345678901234567890123456789.01234567890123456789");
+      "012345678901234567890123456789012345678901234567890123456789adsa.0123456789012345");
   test_clean_filename(
-      "01234567890123456789012345678901234567890123456789<>*?: <>*?:0123456789adsasdasdsaa.   "
+      "01234567890123456789012345678901234567890123456789adsa<>*?: <>*?:0123456789adsasdasdsaa.   "
       "0123456789`<><<>><><>0123456789asdasdasdasd",
-      "01234567890123456789012345678901234567890123456789.0123456789");
+      "01234567890123456789012345678901234567890123456789adsa.0123456789");
   test_clean_filename(
-      "01234567890123456789012345678901234567890123456789<>*?: <>*?:0123456789adsasdasdsaa.   "
-      "0123456789`<><><>0123456789asdasdasdasd",
-      "01234567890123456789012345678901234567890123456789.0123456789       012");
+      "012345678901234567890123456789012345678901234567890123<>*?: <>*?:0123456789adsasdasdsaa.   "
+      "0123456789`<>0123456789asdasdasdasd",
+      "012345678901234567890123456789012345678901234567890123.0123456789   012");
   test_clean_filename("C:/document.tar.gz", "document.tar.gz");
   test_clean_filename("test....", "test");
   test_clean_filename("....test", "test");
   test_clean_filename("test.exe....", "test.exe");  // extension has changed
   test_clean_filename("test.exe01234567890123456789....",
-                      "test.exe01234567890123456789");  // extension may be more than 20 characters
+                      "test.exe01234567890123456789");  // extension may be more than 16 characters
   test_clean_filename("....test....asdf", "test.asdf");
   test_clean_filename("കറുപ്പ്.txt", "കറപപ.txt");
 }