diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index 38db1a6b28..ccf6ccf20c 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -54,9 +54,8 @@
 CVAR(Bool, r_fogboundary, true, 0)
 CVAR(Bool, r_drawmirrors, true, 0)
 EXTERN_CVAR(Bool, r_fullbrightignoresectorcolor);
-EXTERN_CVAR(Bool, r_mipmap)
 
-namespace swrenderer       
+namespace swrenderer
 {
 	using namespace drawerargs;
 
diff --git a/src/r_things.cpp b/src/r_things.cpp
index f03bfbae0a..a1ace0d49c 100644
--- a/src/r_things.cpp
+++ b/src/r_things.cpp
@@ -3241,12 +3241,12 @@ void R_CheckOffscreenBuffer(int width, int height, bool spansonly)
 	{
 		if (OffscreenColorBuffer == NULL)
 		{
-			OffscreenColorBuffer = new BYTE[width * height * 4];
+			OffscreenColorBuffer = new BYTE[width * height];
 		}
 		else if (OffscreenBufferWidth != width || OffscreenBufferHeight != height)
 		{
 			delete[] OffscreenColorBuffer;
-			OffscreenColorBuffer = new BYTE[width * height * 4];
+			OffscreenColorBuffer = new BYTE[width * height];
 		}
 	}
 	OffscreenBufferWidth = width;