diff --git a/src/powder.c b/src/powder.c
index 4724b7a3f..68e199b0c 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -2785,16 +2785,11 @@ void update_particles(pixel *vid)//doesn't update the particles themselves, but
 			{
 				if (emap[y][x])
 					emap[y][x] --;
+				bmap_blockair[y][x] = (bmap[y][x]==WL_WALL || bmap[y][x]==WL_WALLELEC || (bmap[y][x]==WL_EWALL && !emap[y][x]));
+				bmap_blockairh[y][x] = (bmap[y][x]==WL_WALL || bmap[y][x]==WL_WALLELEC || bmap[y][x]==WL_GRAV || (bmap[y][x]==WL_EWALL && !emap[y][x]));
 			}
 		}
 	}
-	
-	for (y=0; y<YRES/CELL; y++)
-		for (x=0; x<XRES/CELL; x++)
-		{
-			bmap_blockair[y][x] = (bmap[y][x]==WL_WALL || bmap[y][x]==WL_WALLELEC || (bmap[y][x]==WL_EWALL && !emap[y][x]));
-			bmap_blockairh[y][x] = (bmap[y][x]==WL_WALL || bmap[y][x]==WL_WALLELEC || bmap[y][x]==WL_GRAV || (bmap[y][x]==WL_EWALL && !emap[y][x]));
-		}
 
 	update_particles_i(vid, 0, 1);