diff --git a/base/renderprogs/bink_gui.vertex b/base/renderprogs/bink_gui.vertex
index fbe8a535..63bc3c23 100644
--- a/base/renderprogs/bink_gui.vertex
+++ b/base/renderprogs/bink_gui.vertex
@@ -3,6 +3,7 @@
 
 Doom 3 BFG Edition GPL Source Code
 Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 
+Copyright (C) 2013 Robert Beckebans
 
 This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  
 
@@ -51,6 +52,6 @@ void main( VS_IN vertex, out VS_OUT result ) {
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
 	result.texcoord0.xy = vertex.texcoord.xy;
-	result.texcoord1 = ( swizzleColor( vertex.color2 ) * 2 ) - 1;
+	result.texcoord1 = ( swizzleColor( vertex.color2 ) * 2.0 ) - 1.0;
 	result.color =  swizzleColor( vertex.color );
 }
diff --git a/base/renderprogs/gui.vertex b/base/renderprogs/gui.vertex
index fbe8a535..63bc3c23 100644
--- a/base/renderprogs/gui.vertex
+++ b/base/renderprogs/gui.vertex
@@ -3,6 +3,7 @@
 
 Doom 3 BFG Edition GPL Source Code
 Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 
+Copyright (C) 2013 Robert Beckebans
 
 This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  
 
@@ -51,6 +52,6 @@ void main( VS_IN vertex, out VS_OUT result ) {
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
 	result.texcoord0.xy = vertex.texcoord.xy;
-	result.texcoord1 = ( swizzleColor( vertex.color2 ) * 2 ) - 1;
+	result.texcoord1 = ( swizzleColor( vertex.color2 ) * 2.0 ) - 1.0;
 	result.color =  swizzleColor( vertex.color );
 }