diff --git a/dlls/CAd/gonome.cpp b/dlls/CAd/gonome.cpp
index 2fc3a4ea..79d27e9f 100644
--- a/dlls/CAd/gonome.cpp
+++ b/dlls/CAd/gonome.cpp
@@ -336,7 +336,7 @@ BOOL CGonome::CheckRangeAttack1(float flDot, float flDist)
 
 	if (flDist > 64 && flDist <= 784 && flDot >= 0.5 && gpGlobals->time >= m_flNextSpitTime)
 	{
-		if (m_hEnemy != NULL)
+		if (m_hEnemy != 0)
 		{
 			if (fabs(pev->origin.z - m_hEnemy->pev->origin.z) > 256)
 			{
@@ -551,7 +551,7 @@ void CGonome::RunAI(void)
 	// first, do base class stuff
 	CBaseMonster::RunAI();
 
-	if (m_hEnemy != NULL && m_Activity == ACT_RUN)
+	if (m_hEnemy != 0 && m_Activity == ACT_RUN)
 	{
 		// chasing enemy. Sprint for last bit
 		if ((pev->origin - m_hEnemy->pev->origin).Length2D() < GONOME_SPRINT_DIST)
diff --git a/dlls/CAd/otis.cpp b/dlls/CAd/otis.cpp
index 72fc9c94..8334fc46 100644
--- a/dlls/CAd/otis.cpp
+++ b/dlls/CAd/otis.cpp
@@ -91,7 +91,7 @@ LINK_ENTITY_TO_CLASS(monster_otis, COtis);
 //=========================================================
 void COtis::AlertSound(void)
 {
-	if (m_hEnemy != NULL)
+	if (m_hEnemy != 0)
 	{
 		if (FOkToSpeak())
 		{
@@ -303,7 +303,7 @@ int COtis::TakeDamage(entvars_t* pevInflictor, entvars_t* pevAttacker, float flD
 
 		// This is a heurstic to determine if the player intended to harm me
 		// If I have an enemy, we can't establish intent (may just be crossfire)
-		if (m_hEnemy == NULL)
+		if (m_hEnemy == 0)
 		{
 			// If the player was facing directly at me, or I'm already suspicious, get mad
 			if ((m_afMemory & bits_MEMORY_SUSPICIOUS) || IsFacing(pevAttacker, pev->origin))
@@ -481,10 +481,10 @@ public:
 	void KeyValue(KeyValueData *pkvd);
 
 	int	m_iPose;// which sequence to display	-- temporary, don't need to save
-	static char *m_szPoses[5];
+	static const char *m_szPoses[5];
 };
 
-char *CDeadOtis::m_szPoses[] = { "lying_on_back", "lying_on_side", "lying_on_stomach", "stuffed_in_vent", "dead_sitting" };
+const char *CDeadOtis::m_szPoses[] = { "lying_on_back", "lying_on_side", "lying_on_stomach", "stuffed_in_vent", "dead_sitting" };
 
 void CDeadOtis::KeyValue(KeyValueData *pkvd)
 {