diff --git a/src/r_draw_column.cpp b/src/r_draw_column.cpp
index 4234427c5..297065ae0 100644
--- a/src/r_draw_column.cpp
+++ b/src/r_draw_column.cpp
@@ -230,7 +230,7 @@ static void R_DrawColumnTemplate(drawcolumndata_t *dc)
 		{
 			if (frac < 0)
 				// adjust in case we underread
-				frac += FRACUNIT;
+				frac += fracstep;
 
 			// texture has no height, so just go
 			while (--count > 0)