diff --git a/source/blood/CMakeLists.txt b/source/blood/CMakeLists.txt
index ecafe832f..22bd2d307 100644
--- a/source/blood/CMakeLists.txt
+++ b/source/blood/CMakeLists.txt
@@ -5,9 +5,9 @@ require_strnicmp()
 
 # Build does not work with signed chars!
 if (MSVC)
-	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /J" )
+	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /J /DNOONE_EXTENSIONS" )
 else()
-	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -funsigned-char -Wno-missing-braces -Wno-char-subscripts -Wno-unused-variable" )
+	set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -funsigned-char -Wno-missing-braces -Wno-char-subscripts -Wno-unused-variable -DNOONE_EXTENSIONS" )
 endif()
 
 include_directories( "${CMAKE_CURRENT_SOURCE_DIR}/../../build/include" )