diff --git a/source/build/include/buildtypes.h b/source/build/include/buildtypes.h
index c0083e426..da0ca8a5a 100644
--- a/source/build/include/buildtypes.h
+++ b/source/build/include/buildtypes.h
@@ -46,6 +46,10 @@ struct sectortype
     int ceilingypan() const { return int(ceilingypan_); }
     int floorxpan() const { return int(floorxpan_); }
     int floorypan() const { return int(floorypan_); }
+    void setfloorxpan(float val) { floorxpan_ = fmod(val + 512, 256); } // +512 is for handling negative offsets
+    void setfloorypan(float val) { floorypan_ = fmod(val + 512, 256); } // +512 is for handling negative offsets
+    void setceilingxpan(float val) { ceilingxpan_ = fmod(val + 512, 256); } // +512 is for handling negative offsets
+    void setceilingypan(float val) { ceilingypan_ = fmod(val + 512, 256); } // +512 is for handling negative offsets
     void addfloorxpan(float add) { floorxpan_ = fmod(floorxpan_ + add + 512, 256); } // +512 is for handling negative offsets
     void addfloorypan(float add) { floorypan_ = fmod(floorypan_ + add + 512, 256); } // +512 is for handling negative offsets
     void addceilingxpan(float add) { ceilingxpan_ = fmod(ceilingxpan_ + add + 512, 256); } // +512 is for handling negative offsets
diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index 2963fa2f2..d38bc9d70 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -1261,8 +1261,8 @@ void moveclouds(double smoothratio)
 		cloudy += ps[screenpeek].angle.ang.bsin(-9);
 		for (int i = 0; i < numclouds; i++)
 		{
-			sector[clouds[i]].addceilingxpan(cloudx / 64.f);
-			sector[clouds[i]].addceilingypan(cloudy / 64.f);
+			sector[clouds[i]].setceilingxpan(cloudx / 64.f);
+			sector[clouds[i]].setceilingypan(cloudy / 64.f);
 		}
 	}
 }