diff --git a/core/systems/ExtensionSys.cpp b/core/systems/ExtensionSys.cpp
index 891105fc..fc85ae4d 100644
--- a/core/systems/ExtensionSys.cpp
+++ b/core/systems/ExtensionSys.cpp
@@ -1375,7 +1375,7 @@ void CExtensionManager::CallOnCoreMapStart(edict_t *pEdictList, int edictCount,
 
 	for (iter=m_Libs.begin(); iter!=m_Libs.end(); iter++)
 	{
-		if (SMINTERFACE_EXTENSIONAPI_VERSION > 3)
+		if ((*iter)->GetAPI()->GetExtensionVersion() > 3)
 		{
 			(*iter)->GetAPI()->OnCoreMapStart(pEdictList, edictCount, clientMax);
 		}
diff --git a/public/IExtensionSys.h b/public/IExtensionSys.h
index 68a8e541..21e7f17a 100644
--- a/public/IExtensionSys.h
+++ b/public/IExtensionSys.h
@@ -40,6 +40,7 @@
  * @brief Defines the interface for loading/unloading/managing extensions.
  */
 
+struct edict_t;
 namespace SourceMod
 {
 	class IExtensionInterface;
@@ -131,7 +132,7 @@ namespace SourceMod
 	 * Note: This is bumped when IShareSys is changed, because IShareSys 
 	 * itself is not versioned.
 	 */
-	#define SMINTERFACE_EXTENSIONAPI_VERSION	3
+	#define SMINTERFACE_EXTENSIONAPI_VERSION	4
 
 	/**
 	 * @brief The interface an extension must expose.