diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index bb443de3..3fa8308a 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -159,7 +159,7 @@ void CHalfLife2::InitLogicalEntData()
 	|| SOURCE_ENGINE == SE_CSS   \
 	|| SOURCE_ENGINE == SE_SDK2013
 
-	if (g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", nullptr))
+	if (g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", NULL))
 	{
 		g_EntList = servertools->GetEntityList();
 	}
diff --git a/extensions/sdktools/tempents.cpp b/extensions/sdktools/tempents.cpp
index 2a41b7b0..09976dd3 100644
--- a/extensions/sdktools/tempents.cpp
+++ b/extensions/sdktools/tempents.cpp
@@ -291,7 +291,7 @@ void TempEntityManager::Initialize()
 	|| SOURCE_ENGINE == SE_CSS   \
 	|| SOURCE_ENGINE == SE_SDK2013
 
-	if (g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", nullptr))
+	if (g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", NULL))
 	{
 		m_ListHead = servertools->GetTempEntList();
 	}
diff --git a/extensions/sdktools/vglobals.cpp b/extensions/sdktools/vglobals.cpp
index 54b533bd..f180d18e 100644
--- a/extensions/sdktools/vglobals.cpp
+++ b/extensions/sdktools/vglobals.cpp
@@ -136,7 +136,7 @@ void GetIServer()
 	|| SOURCE_ENGINE == SE_CSS   \
 	|| SOURCE_ENGINE == SE_SDK2013
 
-	if (g_SMAPI->GetEngineFactory(false)("VEngineServer022", nullptr))
+	if (g_SMAPI->GetEngineFactory(false)("VEngineServer022", NULL))
 	{
 		iserver = engine->GetIServer();
 		return;
diff --git a/extensions/sdktools/vnatives.cpp b/extensions/sdktools/vnatives.cpp
index 3539ccb6..7d5d1c13 100644
--- a/extensions/sdktools/vnatives.cpp
+++ b/extensions/sdktools/vnatives.cpp
@@ -799,7 +799,7 @@ static cell_t FindEntityByClassname(IPluginContext *pContext, const cell_t *para
 	|| SOURCE_ENGINE == SE_CSS   \
 	|| SOURCE_ENGINE == SE_SDK2013
 
-	static bool bHasServerTools3 = !!g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", nullptr);
+	static bool bHasServerTools3 = !!g_SMAPI->GetServerFactory(false)("VSERVERTOOLS003", NULL);
 	if (bHasServerTools3)
 	{
 		CBaseEntity *pStartEnt = NULL;