diff --git a/src/custom/vehcustmzr.cpp b/src/custom/vehcustmzr.cpp
index c298e60..d0e0363 100644
--- a/src/custom/vehcustmzr.cpp
+++ b/src/custom/vehcustmzr.cpp
@@ -312,10 +312,12 @@ VehCustmzrMgr::VehCustmzrMgr()
 #endif
 }
 
+#ifdef GTASA
 bool VehCustmzrMgr::IsValidComponent(CVehicle *pVeh, unsigned int compID)
 {
     return CallAndReturn<bool, 0x49B010, int, CVehicle*>(compID, pVeh);
 }
+#endif 
 
 void VehCustmzrMgr::Draw()
 {