diff --git a/toolchain/blackberry-toolchain.xml b/toolchain/blackberry-toolchain.xml
index 4ae83a689..6d3d3a4d2 100644
--- a/toolchain/blackberry-toolchain.xml
+++ b/toolchain/blackberry-toolchain.xml
@@ -39,7 +39,6 @@
 	<cppflag value="-lang-c++"/>
 	<include name="toolchain/common-defines.xml" />
 	<flag value="-DHXCPP_LOAD_DEBUG" if="HXCPP_LOAD_DEBUG"/>
-	<flag value="-DHXCPP_MULTI_THREADED" if="HXCPP_MULTI_THREADED"/>
 	<flag value="-fpic"/>
 	<flag value="-fPIC"/>
 	<cppflag value="-frtti"/>
diff --git a/toolchain/emscripten-toolchain.xml b/toolchain/emscripten-toolchain.xml
index 3a5a61142..1364916b4 100644
--- a/toolchain/emscripten-toolchain.xml
+++ b/toolchain/emscripten-toolchain.xml
@@ -99,7 +99,6 @@
   <flag value="-fPIC" if="HXCPP_EMSCRIPTEN_FPIC" />
   <flag value="-DEMSCRIPTEN"/>
   <flag value="-DHXCPP_JS_PRIME" if="HXCPP_JS_PRIME" />
-  <flag value="-DHXCPP_MULTI_THREADED" if="HXCPP_MULTI_THREADED"/>
   <flag value="-DHXCPP_BIG_ENDIAN" if="HXCPP_BIG_ENDIAN"/>
   <flag value="-Wno-overflow" />
   <cppflag value="-Wno-invalid-offsetof" />
diff --git a/toolchain/linux-toolchain.xml b/toolchain/linux-toolchain.xml
index 6fd3347fa..dbf012e4d 100644
--- a/toolchain/linux-toolchain.xml
+++ b/toolchain/linux-toolchain.xml
@@ -47,12 +47,10 @@
   <cppflag value="-Wno-invalid-offsetof" />
   <flag value="-DHX_LINUX"/>
   <flag value="-DRASPBERRYPI=RASPBERRYPI" if="rpi"/>
-  <flag value="-DHXCPP_MULTI_THREADED" if="HXCPP_MULTI_THREADED"/>
   <flag value="-DHXCPP_BIG_ENDIAN" if="HXCPP_BIG_ENDIAN"/>
   <include name="toolchain/common-defines.xml" />
   <flag value="-m32" unless="noM32"/>
   <flag value="-m64" if="HXCPP_M64" unless="noM64" />
-  <flag value="-DHXCPP_M64" if="HXCPP_M64"/>
   <flag value="-I${HXCPP}/include"/>
   <objdir value="obj/linux${OBJEXT}/"/>
   <outflag value="-o"/>
diff --git a/toolchain/mingw-toolchain.xml b/toolchain/mingw-toolchain.xml
index c7a11fa43..e974526c3 100644
--- a/toolchain/mingw-toolchain.xml
+++ b/toolchain/mingw-toolchain.xml
@@ -43,7 +43,6 @@
   <flag value="-DHXCPP_BIG_ENDIAN" if="HXCPP_BIG_ENDIAN"/>
   <flag value="-m32" unless="HXCPP_M64"/>
   <flag value="-m64" if="HXCPP_M64"/>
-  <flag value="-DHXCPP_M64" if="HXCPP_M64"/>
   <flag value="-I${HXCPP}/include"/>
   <objdir value="obj/mingw${OBJEXT}/"/>
   <outflag value="-o"/>