diff --git a/source/games/duke/src/funct.h b/source/games/duke/src/funct.h
index 21f0740d9..a613fc52d 100644
--- a/source/games/duke/src/funct.h
+++ b/source/games/duke/src/funct.h
@@ -250,6 +250,7 @@ void backupview(player_struct* p);
 void backupweapon(player_struct* p);
 void resetinputhelpers(player_struct* p);
 void checkhardlanding(player_struct* p);
+void playerweaponsway(player_struct* p, spritetype* s);
 
 void playerAddAngle(player_struct* p, int ang);
 void playerSetAngle(player_struct* p, int ang);
diff --git a/source/games/duke/src/player.cpp b/source/games/duke/src/player.cpp
index cf38285f3..ce3eaaa5a 100644
--- a/source/games/duke/src/player.cpp
+++ b/source/games/duke/src/player.cpp
@@ -927,6 +927,30 @@ void checkhardlanding(player_struct* p)
 	}
 }
 
+void playerweaponsway(player_struct* p, spritetype* s)
+{
+	if (cl_weaponsway)
+	{
+		if (s->xvel < 32 || p->on_ground == 0 || p->bobcounter == 1024)
+		{
+			if ((p->weapon_sway & 2047) > (1024 + 96))
+				p->weapon_sway -= 96;
+			else if ((p->weapon_sway & 2047) < (1024 - 96))
+				p->weapon_sway += 96;
+			else p->oweapon_sway = p->weapon_sway = 1024;
+		}
+		else
+		{
+			p->weapon_sway = p->bobcounter;
+
+			if ((p->bobcounter - p->oweapon_sway) > 256)
+			{
+				p->oweapon_sway = p->weapon_sway;
+			}
+		}
+	}
+}
+
 //---------------------------------------------------------------------------
 //
 //
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index 18fdbf677..ca87a2dde 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -2731,23 +2731,7 @@ void processinput_d(int snum)
 	if (p->on_crane >= 0)
 		goto HORIZONLY;
 
-	if (s->xvel < 32 || p->on_ground == 0 || p->bobcounter == 1024)
-	{
-		if ((p->weapon_sway & 2047) > (1024 + 96))
-			p->weapon_sway -= 96;
-		else if ((p->weapon_sway & 2047) < (1024 - 96))
-			p->weapon_sway += 96;
-		else p->oweapon_sway = p->weapon_sway = 1024;
-	}
-	else
-	{
-		p->weapon_sway = p->bobcounter;
-
-		if ((p->bobcounter - p->oweapon_sway) > 256)
-		{
-			p->oweapon_sway = p->weapon_sway;
-		}
-	}
+	playerweaponsway(p, s);
 
 	s->xvel =
 		ksqrt((p->posx - p->bobposx) * (p->posx - p->bobposx) + (p->posy - p->bobposy) * (p->posy - p->bobposy));
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 82d5578e4..b542147ae 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -3637,23 +3637,7 @@ void processinput_r(int snum)
 	if (p->on_crane >= 0)
 		goto HORIZONLY;
 
-	if (s->xvel < 32 || p->on_ground == 0 || p->bobcounter == 1024)
-	{
-		if ((p->weapon_sway & 2047) > (1024 + 96))
-			p->weapon_sway -= 96;
-		else if ((p->weapon_sway & 2047) < (1024 - 96))
-			p->weapon_sway += 96;
-		else p->oweapon_sway = p->weapon_sway = 1024;
-	}
-	else
-	{
-		p->weapon_sway = p->bobcounter;
-
-		if ((p->bobcounter - p->oweapon_sway) > 256)
-		{
-			p->oweapon_sway = p->weapon_sway;
-		}
-	}
+	playerweaponsway(p, s);
 
 	s->xvel =
 		ksqrt((p->posx - p->bobposx) * (p->posx - p->bobposx) + (p->posy - p->bobposy) * (p->posy - p->bobposy));