diff --git a/ui/UISystem.cpp b/ui/UISystem.cpp
index 2c18e5a3..0520b238 100644
--- a/ui/UISystem.cpp
+++ b/ui/UISystem.cpp
@@ -175,7 +175,7 @@
 
 #define UI_MOUSE_HOTX 2
 #define UI_MOUSE_HOTY 2
-#define UI_FRAMETIME 0.05
+constexpr int ui_FrameTimeMS = 50;
 //////////////////////////////////////////////////////////////////////////////
 //	VARIABLES
 struct tUIWindowNode {
@@ -502,9 +502,9 @@ int ui_DoFrame(bool input) {
     ui_DoWindowFocus();              //	determine window with current input focus.
     res = ui_ProcessFocusedWindow(); //	process focused window
 
-    //		int64_t cur_time = timer_GetMSTime();
-    while ((timer_GetTime() - UI_input.cur_time) < UI_FRAMETIME) {
-    };
+    const float elapsedTimeS = timer_GetTime() - UI_input.cur_time;
+    const int waitTimeMS = ui_FrameTimeMS - static_cast<int>(elapsedTimeS * 1000.0f);
+    D3::ChronoTimer::SleepMS(waitTimeMS);
 
     float temp_time = timer_GetTime();
     UIFrameTime = temp_time - UI_input.cur_time;