diff --git a/src/common/engine/i_interface.h b/src/common/engine/i_interface.h
index 80cc3b1e9..830e74a55 100644
--- a/src/common/engine/i_interface.h
+++ b/src/common/engine/i_interface.h
@@ -22,6 +22,7 @@ struct SystemCallbacks
 	void (*MenuDim)();
 	FString(*GetPlayerName)(int i);
 	bool (*DispatchEvent)(event_t* ev);
+	bool (*CheckGame)(const char* nm);
 };
 
 extern SystemCallbacks sysCallbacks;
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 1d4748ae8..9819a6c7d 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -2741,6 +2741,11 @@ static bool System_DispatchEvent(event_t* ev)
 	return false;
 }
 
+static bool System_CheckGame(const char* name)
+{
+	return CheckGame(name, false);
+}
+
 bool System_NetGame()
 {
 	return netgame;
@@ -3073,6 +3078,7 @@ static int D_DoomMain_Internal (void)
 		System_M_Dim,
 		System_GetPlayerName,
 		System_DispatchEvent,
+		System_CheckGame,
 	};