diff --git a/source/games/duke/src/sbar_d.cpp b/source/games/duke/src/sbar_d.cpp
index 75c79bc08..605170529 100644
--- a/source/games/duke/src/sbar_d.cpp
+++ b/source/games/duke/src/sbar_d.cpp
@@ -133,7 +133,7 @@ public:
 		{
 			int s = -8;
 			if (althud_flashing && p->last_extra > max_player_health)
-				s += (sintable[(ud.levelclock << 6) & 2047] >> 10);
+				s += (sintable[(I_GetBuildTime() << 5) & 2047] / 768);
 			int intens = clamp(255 - 6 * s, 0, 255);
 			format.Format("%d", p->last_extra);
 			SBar_DrawString(this, &numberFont, format, 25, texty, DI_TEXT_ALIGN_LEFT, CR_UNTRANSLATED, intens / 255., 0, 0, 1, 1);
diff --git a/source/games/duke/src/sbar_r.cpp b/source/games/duke/src/sbar_r.cpp
index befcc4467..7c8453d60 100644
--- a/source/games/duke/src/sbar_r.cpp
+++ b/source/games/duke/src/sbar_r.cpp
@@ -110,7 +110,7 @@ public:
 		{
 			int s = -8;
 			if (althud_flashing && p->last_extra > max_player_health)
-				s += (sintable[(ud.levelclock << 6) & 2047] >> 10);
+				s += (sintable[(I_GetBuildTime() << 5) & 2047] / 768);
 			int intens = clamp(255 - 6 * s, 0, 255);
 			format.Format("%d", p->last_extra);
 			SBar_DrawString(this, &numberFont, format, 26.5, -numberFont.mFont->GetHeight() * scale + 4, DI_TEXT_ALIGN_LEFT, CR_UNTRANSLATED, intens / 255., 0, 0, scale, scale);