diff --git a/modules/base/timer/modTimer.c b/modules/base/timer/modTimer.c
index 429335a68e..0276c62256 100644
--- a/modules/base/timer/modTimer.c
+++ b/modules/base/timer/modTimer.c
@@ -79,7 +79,11 @@ static void createTimer(xsMachine *the, int interval, int repeat)
 	ts.the = the;
 	ts.callback = xsToReference(xsArg(0));
 	ts.self = xsNewHostObject(NULL);
+#if mxWindows
+	timer = modTimerAdd(interval, repeat, xs_timer_callback, &ts, sizeof(ts), the->window);
+#else
 	timer = modTimerAdd(interval, repeat, xs_timer_callback, &ts, sizeof(ts));
+#endif
 	if (!timer)
 		xsUnknownError("add failed");
 	xsRemember(((modTimerScript)modTimerGetRefcon(timer))->self);
diff --git a/modules/base/timer/modTimer.h b/modules/base/timer/modTimer.h
index eb33a3442d..dda9f13b92 100644
--- a/modules/base/timer/modTimer.h
+++ b/modules/base/timer/modTimer.h
@@ -33,7 +33,11 @@ typedef struct modTimerRecord *modTimer;
 
 typedef void (*modTimerCallback)(modTimer timer, void *refcon, int refconSize);
 
+#if mxWindows
+extern modTimer modTimerAdd(int firstInterval, int secondInterval, modTimerCallback cb, void *refcon, int refconSize, HWND targetWindow);
+#else
 extern modTimer modTimerAdd(int firstInterval, int secondInterval, modTimerCallback cb, void *refcon, int refconSize);
+#endif
 extern void modTimerReschedule(modTimer timer, int firstInterval, int secondInterval);
 extern uint16_t modTimerGetID(modTimer timer);
 extern int modTimerGetSecondInterval(modTimer timer);
diff --git a/modules/base/timer/win/timer.c b/modules/base/timer/win/timer.c
index b52d95df2f..4f0d89a026 100644
--- a/modules/base/timer/win/timer.c
+++ b/modules/base/timer/win/timer.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2022  Moddable Tech, Inc.
+ * Copyright (c) 2016-2023 Moddable Tech, Inc.
  *
  *   This file is part of the Moddable SDK Runtime.
  * 
@@ -38,6 +38,7 @@ struct modTimerRecord {
 	uint8_t rescheduled;
 	uint8_t repeating;
 	modTimerCallback cb;
+	HWND window;
 	uint32_t refconSize;
 	char refcon[1];
 };
@@ -49,13 +50,14 @@ static CRITICAL_SECTION gCS;
 
 static void modTimerExecuteOne(modTimer timer);
 static modTimer modTimerFindNative(UINT_PTR idEvent);
+void modTimerWindowCallback(LPARAM timer);
 
 static VOID CALLBACK TimerProc(UINT uTimerID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2) {
 	modTimer timer;
 
 	timer = modTimerFindNative(uTimerID);
 	if (timer)
-		modTimerExecuteOne(timer);
+		SendMessage(timer->window, WM_MODTIMER, (WPARAM)&modTimerWindowCallback, (LPARAM)timer);
 }
 
 static void modCriticalSectionBegin()
@@ -68,6 +70,11 @@ static void modCriticalSectionEnd()
 	LeaveCriticalSection(&gCS);
 }
 
+void modTimerWindowCallback(LPARAM t) {
+	modTimer timer = (modTimer)t;
+	modTimerExecuteOne(timer);
+}
+
 static void modTimerExecuteOne(modTimer timer)
 {
 	timer->rescheduled = 0;
@@ -98,7 +105,7 @@ static modTimer modTimerFindNative(UINT_PTR idEvent)
 	return walker;
 }
 
-modTimer modTimerAdd(int firstInterval, int secondInterval, modTimerCallback cb, void *refcon, int refconSize)
+modTimer modTimerAdd(int firstInterval, int secondInterval, modTimerCallback cb, void *refcon, int refconSize, HWND targetWindow)
 {
 	modTimer timer;	
 
@@ -117,10 +124,10 @@ modTimer modTimerAdd(int firstInterval, int secondInterval, modTimerCallback cb,
 	timer->useCount = 1;
 	timer->repeating = 0;
 	timer->cb = cb;
+	timer->window = targetWindow;
 	timer->refconSize = refconSize;
 	c_memmove(timer->refcon, refcon, refconSize);
 
-	// timer->idEvent = SetTimer(NULL, timer->id, firstInterval, TimerProc);
 	if (firstInterval == 0)
 		firstInterval = 1;
 	timer->idEvent = timeSetEvent(firstInterval, 1, TimerProc, timer->id, TIME_ONESHOT);
diff --git a/xs/platforms/win_xs.c b/xs/platforms/win_xs.c
index fd2f586b45..052715786a 100644
--- a/xs/platforms/win_xs.c
+++ b/xs/platforms/win_xs.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2022  Moddable Tech, Inc.
+ * Copyright (c) 2016-2023 Moddable Tech, Inc.
  *
  *   This file is part of the Moddable SDK Runtime.
  * 
@@ -69,6 +69,10 @@ LRESULT CALLBACK fxMessageWindowProc(HWND window, UINT message, WPARAM wParam, L
 			job = next;
 		}	
 	} break;
+	case WM_MODTIMER: {
+		txMachine* the = (txMachine*)GetWindowLongPtr(window, 0);
+		(*((timerCallback)wParam))(lParam);
+	} break;
 #ifdef mxDebug
 	case WM_XSBUG: {
 		txMachine* the = (txMachine*)GetWindowLongPtr(window, 0);
diff --git a/xs/platforms/win_xs.h b/xs/platforms/win_xs.h
index 574904af91..4a8357c1c1 100644
--- a/xs/platforms/win_xs.h
+++ b/xs/platforms/win_xs.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017  Moddable Tech, Inc.
+ * Copyright (c) 2016-2023 Moddable Tech, Inc.
  *
  *   This file is part of the Moddable SDK Runtime.
  * 
@@ -95,9 +95,12 @@ extern void fxQueueWorkerJob(void* machine, void* job);
 #define WM_XSBUG WM_USER + 2
 #define WM_CALLBACK WM_USER + 3
 #define WM_WORKER WM_USER + 4
+#define WM_MODTIMER WM_USER + 5
 	
 #ifdef mxDebug
 	#define MODDEF_XS_TEST 1
 #endif
 
+typedef void (*timerCallback)(LPARAM lParam);
+
 #endif /* __WIN_XS__ */