diff --git a/TouchGFX/simulator/gcc/Makefile b/TouchGFX/simulator/gcc/Makefile
index c655cf3..1481c1b 100644
--- a/TouchGFX/simulator/gcc/Makefile
+++ b/TouchGFX/simulator/gcc/Makefile
@@ -20,7 +20,7 @@ all clean assets:
 $(error Spaces not allowed in path)
 else
 
-ADDITIONAL_SOURCES := 
+ADDITIONAL_SOURCES := $(application_path)/../Core/Src/vehicle_state.c
 ADDITIONAL_INCLUDE_PATHS := $(application_path)/../Core/Inc
 ADDITIONAL_LIBRARY_PATHS := 
 ADDITIONAL_LIBRARIES :=
diff --git a/TouchGFX/simulator/main.cpp b/TouchGFX/simulator/main.cpp
index ba1cb34..c5a0dc4 100644
--- a/TouchGFX/simulator/main.cpp
+++ b/TouchGFX/simulator/main.cpp
@@ -49,7 +49,6 @@ int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
 
 // Stubs
 extern "C" {
-VehicleState vehicle_state;
 void params_dec(ParamType param) {}
 void params_inc(ParamType param) {}
 void params_broadcast(ParamType param) {}