diff --git a/bleh_darwin.m b/bleh_darwin.m
index f21d55c..b537603 100644
--- a/bleh_darwin.m
+++ b/bleh_darwin.m
@@ -172,6 +172,11 @@ struct xsize objc_msgSend_stret_size_noargs(id obj, SEL sel)
 	return t;
 }
 
+id objc_msgSend_size(id obj, SEL sel, int64_t width, int64_t height)
+{
+	return objc_msgSend(obj, sel, NSMakeSize((CGFloat) width, (CGFloat) height));
+}
+
 /*
 and again for NSPoint
 */
diff --git a/objc_darwin.h b/objc_darwin.h
index fbe169c..aaca07e 100644
--- a/objc_darwin.h
+++ b/objc_darwin.h
@@ -88,13 +88,14 @@ m1(ptr, void *)
 m1(bool, BOOL)
 extern id objc_msgSend_int(id obj, SEL sel, intptr_t a);
 m1(double, double)
+extern id objc_msgSend_point(id obj, SEL sel, int64_t x, int64_t y);
+extern id objc_msgSend_size(id objc, SEL sel, int64_t width, int64_t height);
 
 m2(id_id, id, id)
 extern id objc_msgSend_rect_bool(id obj, SEL sel, int64_t x, int64_t y, int64_t w, int64_t h, BOOL b);
 extern id objc_msgSend_id_int(id obj, SEL sel, id a, intptr_t b);
 extern id objc_msgSend_id_uint(id obj, SEL sel, id a, uintptr_t b);
 m2(id_bool, id, BOOL)
-extern id objc_msgSend_point(id obj, SEL sel, int64_t x, int64_t y);
 
 m3(id_id_id, id, id, id)
 m3(sel_id_bool, SEL, id, BOOL)
diff --git a/sysdata_darwin.go b/sysdata_darwin.go
index ed50132..acfe11e 100644
--- a/sysdata_darwin.go
+++ b/sysdata_darwin.go
@@ -60,7 +60,7 @@ var (
 	_title = sel_getUid("title")
 	_stringValue = sel_getUid("stringValue")
 	_frame = sel_getUid("frame")
-	_setFrameDisplay = sel_getUid("setFrame:display:")
+	_setContentSize = sel_getUid("setContentSize:")
 	_setBezelStyle = sel_getUid("setBezelStyle:")
 	_setTarget = sel_getUid("setTarget:")
 	_setAction = sel_getUid("setAction:")
@@ -519,11 +519,9 @@ func (s *sysData) setWindowSize(width int, height int) error {
 	ret := make(chan struct{})
 	defer close(ret)
 	uitask <- func() {
-		// we need to get the top left point
-		r := C.objc_msgSend_stret_rect_noargs(s.id, _frame)
-		C.objc_msgSend_rect_bool(s.id, _setFrameDisplay,
-			C.int64_t(r.x), C.int64_t(r.y), C.int64_t(width), C.int64_t(height),
-			C.BOOL(C.YES))		// TODO set to NO to prevent subviews from being redrawn before they are resized?
+		C.objc_msgSend_size(s.id, _setContentSize,
+			C.int64_t(width), C.int64_t(height))
+		C.objc_msgSend_noargs(s.id, _display)		// TODO needed?
 		ret <- struct{}{}
 	}
 	<-ret