diff --git a/src/powder.c b/src/powder.c
index 0348cf3b5..509f53254 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -1906,7 +1906,7 @@ killed:
 						clear_y = (int)(clear_yf+0.5f);
 						break;
 					}
-					if (fin_x<CELL || fin_y<CELL || fin_x>=XRES-CELL || fin_y>=YRES-CELL || pmap[fin_y][fin_x] || (bmap[fin_y/CELL][fin_x/CELL] && bmap[fin_y/CELL][fin_x/CELL]!=WL_STREAM))
+					if (fin_x<CELL || fin_y<CELL || fin_x>=XRES-CELL || fin_y>=YRES-CELL || pmap[fin_y][fin_x] || (bmap[fin_y/CELL][fin_x/CELL] && !eval_move(t,fin_x,fin_y,NULL)))
 					{
 						// found an obstacle
 						clear_xf = fin_xf-dx;