diff --git a/src/r_draw_column.cpp b/src/r_draw_column.cpp
index e070500cf..abd970e3c 100644
--- a/src/r_draw_column.cpp
+++ b/src/r_draw_column.cpp
@@ -234,12 +234,12 @@ static void R_DrawColumnTemplate(drawcolumndata_t *dc)
 			// texture has no height, so just go
 			while (--count > 0)
 			{
-				INT32 n = frac >> FRACBITS;
+				*dest = R_DrawColumnPixel<Type>(dc, dest, frac>>FRACBITS);
 				dest += vid.width;
-				*dest = R_DrawColumnPixel<Type>(dc, dest, n);
+				frac += fracstep;
 			}
 		}
-		else if (dc->texheight & heightmask)   // not a power of 2 -- killough
+		else if (dc->sourcelength & heightmask)   // not a power of 2 -- killough
 		{
 			heightmask = dc->texheight << FRACBITS;