diff --git a/src/powder.c b/src/powder.c
index 2d010b292..91a478dfd 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -2216,7 +2216,7 @@ 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_DESTROYALL || bmap[fin_y/CELL][fin_x/CELL]==WL_DETECT || !eval_move(t,fin_x,fin_y,NULL))))
+					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_DESTROYALL || !eval_move(t,fin_x,fin_y,NULL))))
 					{
 						// found an obstacle
 						clear_xf = fin_xf-dx;
@@ -2225,7 +2225,8 @@ killed:
 						clear_y = (int)(clear_yf+0.5f);
 						break;
 					}
-
+					if (bmap[fin_y/CELL][fin_x/CELL]==WL_DETECT && emap[fin_y/CELL][fin_x/CELL]<8)
+						set_emap(fin_x/CELL, fin_y/CELL);
 				}
 			}