diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index 2bf2f8903..9ab647c4b 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -1255,8 +1255,8 @@ void moveclouds(double smoothratio)
 		cloudclock = myclock + 6;
 
 		// cloudx/y were an array, but all entries were always having the same value so a single pair is enough.
-		cloudx += (sintable[(ps[screenpeek].angle.ang.asbuild() + 512) & 2047] >> 9);
-		cloudy += (sintable[ps[screenpeek].angle.ang.asbuild() & 2047] >> 9);
+		cloudx += ps[screenpeek].angle.ang.bcos(-9);
+		cloudy += ps[screenpeek].angle.ang.bsin(-9);
 		for (int i = 0; i < numclouds; i++)
 		{
 			sector[clouds[i]].ceilingxpanning = cloudx >> 6;