diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 7ad2117ea..ed1893fd3 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -49,7 +49,7 @@ if (NOT CMAKE_CROSSCOMPILING OR EMSCRIPTEN)
   add_executable(test-tdutils EXCLUDE_FROM_ALL ${TESTS_MAIN} ${TDUTILS_TEST_SOURCE})
   add_executable(test-online EXCLUDE_FROM_ALL online.cpp)
   add_executable(run_all_tests ${TESTS_MAIN} ${TD_TEST_SOURCE})
-  if (CLANG AND NOT CYGWIN AND NOT EMSCRIPTEN AND NOT (CMAKE_HOST_SYSTEM_NAME MATCHES "OpenBSD"))
+  if (CLANG AND NOT CYGWIN AND NOT EMSCRIPTEN AND NOT (CMAKE_HOST_SYSTEM_NAME MATCHES "OpenBSD") AND NOT (CMAKE_SIZEOF_VOID_P EQUAL 4))
     target_compile_options(test-tdutils PUBLIC -fsanitize=undefined -fno-sanitize=vptr)
     target_compile_options(run_all_tests PUBLIC -fsanitize=undefined -fno-sanitize=vptr)
     target_compile_options(test-online PUBLIC -fsanitize=undefined -fno-sanitize=vptr)