diff --git a/source/games/duke/CMakeLists.txt b/source/games/duke/CMakeLists.txt
index a9bbc8743..ab7d46629 100644
--- a/source/games/duke/CMakeLists.txt
+++ b/source/games/duke/CMakeLists.txt
@@ -51,7 +51,6 @@ set( PCH_SOURCES
 	src/zz_premap.cpp
 	src/zz_savegame.cpp
 	src/zz_screens.cpp
-	src/zz_sector.cpp
 	)
 
 add_game_library2( duke )
diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index e896f2001..6ee085d12 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -1099,6 +1099,30 @@ void allignwarpelevators(void)
 	}
 }
 
+//---------------------------------------------------------------------------
+//
+// 
+//
+//---------------------------------------------------------------------------
+
+void moveclouds(void)
+{
+	if (totalclock > cloudtotalclock || totalclock < (cloudtotalclock - 7))
+	{
+		cloudtotalclock = totalclock + 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].getang() + 512) & 2047] >> 9);
+		cloudy += (sintable[ps[screenpeek].getang() & 2047] >> 9);
+		for (int i = 0; i < numclouds; i++)
+		{
+			sector[clouds[i]].ceilingxpanning = cloudx >> 6;
+			sector[clouds[i]].ceilingypanning = cloudy >> 6;
+		}
+	}
+}
+
+
 
 
 END_DUKE_NS
diff --git a/source/games/duke/src/zz_screens.cpp b/source/games/duke/src/zz_screens.cpp
index 0bbf32b9e..e7c5dd7ac 100644
--- a/source/games/duke/src/zz_screens.cpp
+++ b/source/games/duke/src/zz_screens.cpp
@@ -117,28 +117,9 @@ static int32_t gtextsc(int32_t sc)
 
 ////////// DISPLAYREST //////////
 
-static inline void G_MoveClouds(void)
-{
-    int32_t i;
-
-    if (totalclock <= g_cloudClock && totalclock >= (g_cloudClock-7))
-        return;
-
-    g_cloudClock = totalclock+6;
-
-    g_cloudX += sintable[(fix16_to_int(g_player[screenpeek].ps->q16ang)+512)&2047]>>9;
-    g_cloudY += sintable[fix16_to_int(g_player[screenpeek].ps->q16ang)&2047]>>9;
-
-    for (i=numclouds-1; i>=0; i--)
-    {
-        sector[clouds[i]].ceilingxpanning = g_cloudX>>6;
-        sector[clouds[i]].ceilingypanning = g_cloudY>>6;
-    }
-}
-
-
 
 void displayweapon(int snum);
+void moveclouds();
 
 void G_DisplayRest(int32_t smoothratio)
 {
@@ -236,7 +217,7 @@ void G_DisplayRest(int32_t smoothratio)
                     fi.displaymasks(screenpeek);
     }
             if (!RR)
-                G_MoveClouds();
+                moveclouds();
         }
 
         if (ud.overhead_on > 0)
diff --git a/source/games/duke/src/zz_sector.cpp b/source/games/duke/src/zz_sector.cpp
deleted file mode 100644
index fb08ab440..000000000
--- a/source/games/duke/src/zz_sector.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-//-------------------------------------------------------------------------
-/*
-Copyright (C) 2010 EDuke32 developers and contributors
-
-This file is part of EDuke32.
-
-EDuke32 is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License version 2
-as published by the Free Software Foundation.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-*/
-//-------------------------------------------------------------------------
-#include "ns.h"	// Must come before everything else!
-
-#define sector_c_
-
-#include "duke3d.h"
-
-#include "secrets.h"
-#include "v_video.h"
-#include "glbackend/glbackend.h"
-
-BEGIN_DUKE_NS
-
-
-
-END_DUKE_NS