diff --git a/Source/monster.cpp b/Source/monster.cpp
index 430476f87..8e690671a 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -4572,7 +4572,7 @@ void ProcessMonsters()
 			Monst->_menemyx = plr[Monst->_menemy]._pfutx;
 			Monst->_menemyy = plr[Monst->_menemy]._pfuty;
 			if (dFlags[mx][my] & BFLAG_VISIBLE) {
-				Monst->_msquelch = 255;
+				Monst->_msquelch = UCHAR_MAX;
 				Monst->_lastx = plr[Monst->_menemy]._pfutx;
 				Monst->_lasty = plr[Monst->_menemy]._pfuty;
 			} else if (Monst->_msquelch != 0 && Monst->_mAi != MT_DIABLO) { /// BUGFIX: change '_mAi' to 'MType->mtype'