diff --git a/build.bat b/build.bat
index 0bbfe44..ccd88f3 100644
--- a/build.bat
+++ b/build.bat
@@ -28,12 +28,9 @@ if %target% == milepost (
 if %target% == orca (
 	echo building orca
 
-	set pthread_dir=..\vcpkg\packages\pthreads_x64-windows
-
 	::copy libraries
 	copy milepost\bin\milepost.dll bin
 	copy milepost\bin\milepost.dll.lib bin
-	copy %pthread_dir%\bin\pthreadVC3.dll bin
 
 	::generate wasm3 api bindings
 	python3 scripts\bindgen.py core src\core_api.json^
@@ -58,8 +55,8 @@ if %target% == orca (
 	        --wasm3-bindings src\io_api_bind_gen.c
 
 	::compile orca
-	set INCLUDES=/I src /I sdk /I ext\wasm3\source /I milepost\src /I milepost\ext /I %pthread_dir%\include
-	set LIBS=/LIBPATH:bin /LIBPATH:%pthread_dir%\lib milepost.dll.lib wasm3.lib pthreadVC3.lib
+	set INCLUDES=/I src /I sdk /I ext\wasm3\source /I milepost\src /I milepost\ext
+	set LIBS=/LIBPATH:bin milepost.dll.lib wasm3.lib
 
-	cl /Zi /Zc:preprocessor /std:c11 %INCLUDES% src\main.c /link %LIBS% /out:bin\orca.exe
+	cl /Zi /Zc:preprocessor /std:c11 /experimental:c11atomics %INCLUDES% src\main.c /link %LIBS% /out:bin\orca.exe
 )
diff --git a/milepost b/milepost
index 442d863..6ec113b 160000
--- a/milepost
+++ b/milepost
@@ -1 +1 @@
-Subproject commit 442d86386ebdc6e119ec765648420b6e096d145d
+Subproject commit 6ec113b708398bcf82a052a2bfb891b3265ca92e
diff --git a/src/main.c b/src/main.c
index 700ddf5..afcbce4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,7 +7,6 @@
 *****************************************************************/
 #include<stdio.h>
 #include<errno.h>
-#include<pthread.h>
 #include<math.h>
 
 #define MG_INCLUDE_GL_API
@@ -306,7 +305,7 @@ void orca_runtime_init(orca_runtime* runtime)
 #include"gles_api_bind_gen.c"
 #include"manual_gles_api.c"
 
-void* orca_runloop(void* user)
+i32 orca_runloop(void* user)
 {
 	orca_app* app = &__orcaApp;
 
@@ -328,7 +327,7 @@ void* orca_runloop(void* user)
 		               options);
 
 		mp_request_quit();
-		return((void*)-1);
+		return(-1);
 	}
 
 	fseek(file, 0, SEEK_END);
@@ -378,7 +377,7 @@ void* orca_runloop(void* user)
 		               options);
 
 		mp_request_quit();
-		return((void*)-1);
+		return(-1);
 	}
 
 	//NOTE: Find and type check event handlers.
@@ -473,7 +472,7 @@ void* orca_runloop(void* user)
 		               	options);
 
 			mp_request_quit();
-			return((void*)-1);
+			return(-1);
 		}
 	}
 
@@ -803,8 +802,7 @@ int main(int argc, char** argv)
 	mp_window_focus(app->window);
 	mp_window_center(app->window);
 
-	pthread_t runloopThread;
-	pthread_create(&runloopThread, 0, orca_runloop, 0);
+	mp_thread* runloopThread = mp_thread_create(orca_runloop, 0);
 
 	while(!mp_should_quit())
 	{
@@ -812,8 +810,7 @@ int main(int argc, char** argv)
 		//TODO: what to do with mem scratch here?
 	}
 
-	void* res;
-	pthread_join(runloopThread, &res);
+	mp_thread_join(runloopThread, NULL);
 
 	mg_canvas_destroy(app->canvas);
 	mg_surface_destroy(app->surface);