diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index 5fd04eb98..8ff157555 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -3070,7 +3070,7 @@ void AddGolem(int mi, int sx, int sy, int dx, int dy, int midir, char mienemy, i
 	missile[mi]._miVar2 = sy;
 	missile[mi]._miVar4 = dx;
 	missile[mi]._miVar5 = dy;
-	if ((monster[id]._mx != 1 || monster[id]._my) && id == myplr)
+	if ((monster[id]._mx != 1 || monster[id]._my != 0) && id == myplr)
 		M_StartKill(id, id);
 	UseMana(id, SPL_GOLEM);
 }
@@ -3690,7 +3690,7 @@ void MI_Golem(int i)
 	char *ct;
 
 	src = missile[i]._misource;
-	if (monster[src]._mx == 1 && !monster[src]._my) {
+	if (monster[src]._mx == 1 && monster[src]._my == 0) {
 		for (l = 0; l < 6; l++) {
 			k = CrawlNum[l];
 			tid = k + 2;
diff --git a/Source/monster.cpp b/Source/monster.cpp
index 883ed44ca..5e6c0faa4 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -3420,7 +3420,7 @@ BOOL M_DoStone(int i)
 		app_fatal("M_DoStone: Invalid monster %d", i);
 #endif
 
-	if (!monster[i]._mhitpoints) {
+	if (monster[i]._mhitpoints == 0) {
 		dMonster[monster[i]._mx][monster[i]._my] = 0;
 		monster[i]._mDelFlag = TRUE;
 	}
diff --git a/Source/objects.cpp b/Source/objects.cpp
index 1eb3d3f95..a7db2c640 100644
--- a/Source/objects.cpp
+++ b/Source/objects.cpp
@@ -4319,7 +4319,7 @@ void OperateBookCase(int pnum, int i, DIABOOL sendmsg)
 			if (QuestStatus(Q_ZHAR)
 			    && monster[MAX_PLRS].mName == UniqMonst[UMT_ZHAR].mName
 			    && monster[MAX_PLRS]._msquelch == UCHAR_MAX
-			    && monster[MAX_PLRS]._mhitpoints) {
+			    && monster[MAX_PLRS]._mhitpoints != 0) {
 				monster[MAX_PLRS].mtalkmsg = TEXT_ZHAR2;
 				M_StartStand(0, monster[MAX_PLRS]._mdir); // BUGFIX: first parameter in call to M_StartStand should be MAX_PLRS, not 0.
 				monster[MAX_PLRS]._mgoal = MGOAL_ATTACK2;