diff --git a/src/powder.c b/src/powder.c
index 3fe4ef5ff..be22ca6ba 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -3103,7 +3103,8 @@ void create_line(int x1, int y1, int x2, int y2, int rx, int ry, int c, int flag
 		if (e >= 0.5f)
 		{
 			y += sy;
-			if (c==WL_EHOLE+100 || c==WL_ALLOWGAS+100 || c==WL_ALLOWENERGY+100 || c==WL_ALLOWALLELEC+100 || c==WL_ALLOWSOLID+100 || c==WL_ALLOWAIR+100 || c==WL_WALL+100 || c==WL_DESTROYALL+100 || c==WL_ALLOWLIQUID+100 || c==WL_FAN+100 || c==WL_STREAM+100 || c==WL_DETECT+100 || c==WL_EWALL+100 || c==WL_WALLELEC+100 || !(rx+ry))
+			if ((c==WL_EHOLE+100 || c==WL_ALLOWGAS+100 || c==WL_ALLOWENERGY+100 || c==WL_ALLOWALLELEC+100 || c==WL_ALLOWSOLID+100 || c==WL_ALLOWAIR+100 || c==WL_WALL+100 || c==WL_DESTROYALL+100 || c==WL_ALLOWLIQUID+100 || c==WL_FAN+100 || c==WL_STREAM+100 || c==WL_DETECT+100 || c==WL_EWALL+100 || c==WL_WALLELEC+100 || !(rx+ry))
+			   && ((y1<y2) ? (y<=y2) : (y>=y2)))
 			{
 				if (cp)
 					create_parts(y, x, rx, ry, c, flags);