diff --git a/src/elements/prto.c b/src/elements/prto.c
index 8f743e702..fbbd5a13f 100644
--- a/src/elements/prto.c
+++ b/src/elements/prto.c
@@ -6,8 +6,8 @@ int update_PRTO(UPDATE_FUNC_ARGS) {
 	parts[i].tmp = (int)((parts[i].temp-73.15f)/100+1);
 	if (parts[i].tmp>=CHANNELS) parts[i].tmp = CHANNELS-1;
 	else if (parts[i].tmp<0) parts[i].tmp = 0;
-	for (rx=-1; rx<2; rx++)
-		for (ry=-1; ry<2; ry++)
+	for (rx=1; rx>-2; rx--)
+		for (ry=1; ry>-2; ry--)
 			if (x+rx>=0 && y+ry>0 && x+rx<XRES && y+ry<YRES && (rx || ry))
 			{
 				r = pmap[y+ry][x+rx];
@@ -21,8 +21,8 @@ int update_PRTO(UPDATE_FUNC_ARGS) {
 						int randomness = count + rand()%3-1;
 						if (randomness<1)
 							randomness=1;
-						if (randomness>8)
-							randomness=8;
+						if (randomness>9)
+							randomness=9;
 						if (portal[parts[i].tmp][randomness-1][nnx]==PT_SPRK)// TODO: make it look better
 						{
 							create_part(-1,x+1,y,portal[parts[i].tmp][randomness-1][nnx]);