diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 1b5428ae94a..8205fdbb7b1 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -21,7 +21,7 @@ if(WIN32)
 	add_compile_definitions(_WIN32_WINNT=0x0601)
 endif()
 
-set(WANTED_FEATURES "ENABLE_MOST_WARNINGS")
+set(WANTED_FEATURES "ENABLE_MOST_WARNINGS" "ENSURE_DEFAULT_CHAR_IS_SIGNED")
 
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
 	list(APPEND WANTED_FEATURES "OPTIMIZE_FOR_SPEED")