diff --git a/source/games/blood/src/ai.cpp b/source/games/blood/src/ai.cpp
index 375d15d69..c0ac85be9 100644
--- a/source/games/blood/src/ai.cpp
+++ b/source/games/blood/src/ai.cpp
@@ -1547,20 +1547,20 @@ void aiLookForTarget(DBloodActor* actor)
 			auto dvec = ppos - actor->spr.pos.XY();
 			auto pSector = pPlayer->actor->sector();
 
-			int nDist = approxDist(dvec);
-			if (nDist > pDudeInfo->seeDist && nDist > pDudeInfo->hearDist)
+			double nDist = dvec.Length();
+			if (nDist > pDudeInfo->SeeDist() && nDist > pDudeInfo->Heardist())
 				continue;
 			double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
 			if (!cansee(ppos, pSector, actor->spr.pos.plusZ(-height), actor->sector()))
 				continue;
-			int nDeltaAngle = getincangle(actor->int_ang(), getangle(dvec));
-			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
+			DAngle nDeltaAngle = absangle(actor->spr.angle, VecToAngle(dvec));
+			if (nDist < pDudeInfo->SeeDist() && nDeltaAngle <= pDudeInfo->Periphery())
 			{
 				aiSetTarget(actor, pPlayer->actor);
 				aiActivateDude(actor);
 				return;
 			}
-			else if (nDist < pDudeInfo->hearDist)
+			else if (nDist < pDudeInfo->Heardist())
 			{
 				aiSetTarget(actor, ppos);
 				aiActivateDude(actor);