diff --git a/wasm/build_wasm.bat b/wasm/build_wasm.bat
index 0f51e363..6e677a2f 100644
--- a/wasm/build_wasm.bat
+++ b/wasm/build_wasm.bat
@@ -32,10 +32,14 @@ copy ..\BeefySysLib\third_party\putty\* src\BeefySysLib\third_party\putty
 
 IF "%1" EQU "setup" GOTO SUCCESS
 
-call emcc src\rt\Chars.cpp src\rt\Math.cpp src\rt\Object.cpp src\rt\Thread.cpp src\rt\Internal.cpp src\BeefySysLib\platform\wasm\WasmCommon.cpp src\BeefySysLib\Common.cpp src\BeefySysLib\util\String.cpp src\BeefySysLib\util\UTF8.cpp src\BeefySysLib\third_party\utf8proc\utf8proc.c src\BeefySysLib\third_party\putty\wildcard.c -Isrc\ -Isrc\BeefySysLib -Isrc\BeefySysLib\platform\wasm -g -DBF_DISABLE_FFI -c -s WASM=1 -s USE_PTHREADS=1
+call emcc src\rt\Chars.cpp src\rt\Math.cpp src\rt\Object.cpp src\rt\Thread.cpp src\rt\Internal.cpp src\BeefySysLib\platform\wasm\WasmCommon.cpp src\BeefySysLib\Common.cpp src\BeefySysLib\util\String.cpp src\BeefySysLib\util\UTF8.cpp src\BeefySysLib\third_party\utf8proc\utf8proc.c src\BeefySysLib\third_party\putty\wildcard.c -Isrc\ -Isrc\BeefySysLib -Isrc\BeefySysLib\platform\wasm -g -DBF_DISABLE_FFI -c
 @IF %ERRORLEVEL% NEQ 0 GOTO HADERROR
 call emar r %LIBPATH%\Beef042RT32_wasm.a Common.o Internal.o Chars.o Math.o Object.o String.o Thread.o UTF8.o utf8proc.o wildcard.o WasmCommon.o
 @IF %ERRORLEVEL% NEQ 0 GOTO HADERROR
+call emcc src\rt\Chars.cpp src\rt\Math.cpp src\rt\Object.cpp src\rt\Thread.cpp src\rt\Internal.cpp src\BeefySysLib\platform\wasm\WasmCommon.cpp src\BeefySysLib\Common.cpp src\BeefySysLib\util\String.cpp src\BeefySysLib\util\UTF8.cpp src\BeefySysLib\third_party\utf8proc\utf8proc.c src\BeefySysLib\third_party\putty\wildcard.c -Isrc\ -Isrc\BeefySysLib -Isrc\BeefySysLib\platform\wasm -g -DBF_DISABLE_FFI -c -pthread
+@IF %ERRORLEVEL% NEQ 0 GOTO HADERROR
+call emar r %LIBPATH%\Beef042RT32_wasm_pthread.a Common.o Internal.o Chars.o Math.o Object.o String.o Thread.o UTF8.o utf8proc.o wildcard.o WasmCommon.o
+@IF %ERRORLEVEL% NEQ 0 GOTO HADERROR
 
 :SUCCESS
 @ECHO SUCCESS!