diff --git a/build/build.bat b/build/build.bat
index 2190210a..a087c364 100644
--- a/build/build.bat
+++ b/build/build.bat
@@ -2,6 +2,7 @@
 set WDK_ROOT=c:\WinDDK\7600.16385.1
 call build-x86.bat
 call build-x64.bat
+call compress.bat
 set PATH=%PROGRAMFILES(X86)%\Inno Setup 5
 compil32 /cc xchat-wdk.iss
 pause
diff --git a/build/compress.bat b/build/compress.bat
new file mode 100644
index 00000000..37df1292
--- /dev/null
+++ b/build/compress.bat
@@ -0,0 +1,19 @@
+@echo off
+set OPATH=%PATH% 
+set PATH=c:\mozilla-build\mpress;c:\mozilla-build\upx
+cd ..\tmp
+for %%A in (*.dll) do upx -9 -q %%A
+for %%A in (*.x64) do mpress -q %%A
+upx xchat.exe
+cd lib\enchant
+for %%A in (*.dll) do upx -9 -q %%A
+for %%A in (*.x64) do mpress -q %%A
+:: gtk-2.0\2.10.0\engines is already packed, skip it
+cd ..\gtk-2.0\modules
+for %%A in (*.dll) do upx -9 -q %%A
+for %%A in (*.x64) do mpress -q %%A
+cd ..\..\..\plugins
+for %%A in (*.dll) do upx -9 -q %%A
+for %%A in (*.x64) do mpress -q %%A
+cd ..\..\build
+set PATH=%OPATH%