diff --git a/stdwndclass_windows.go b/stdwndclass_windows.go
index 2824746..276fdc6 100644
--- a/stdwndclass_windows.go
+++ b/stdwndclass_windows.go
@@ -51,10 +51,13 @@ func stdWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam
 				if r1 == 0 {
 					panic("GetClientRect failed: " + err.Error())
 				}
-				err = s.resize(int(r.Left), int(r.Top), int(r.Right), int(r.Bottom))
-				if err != nil {
-					panic("child resize failed: " + err.Error())
-				}
+				// run the resize in a goroutine, since the WndProc is being run on uitask
+				go func() {
+					err = s.resize(int(r.Left), int(r.Top), int(r.Right), int(r.Bottom))
+					if err != nil {
+						panic("child resize failed: " + err.Error())
+					}
+				}()
 			}
 			return 0
 		case _WM_CLOSE: