diff --git a/src/core.h b/src/core.h
index 50078e1..1a2488e 100644
--- a/src/core.h
+++ b/src/core.h
@@ -31,6 +31,7 @@
 
     extern void osToggleVR(bool enable);
 #elif __SDL2__
+    extern void osToggleVR(bool enable);
     #define _GAPI_GL   1
 #ifdef SDL2_GLES
     #define _GAPI_GLES 1
diff --git a/src/platform/sdl2/main.cpp b/src/platform/sdl2/main.cpp
index 42eca0f..2034ecf 100644
--- a/src/platform/sdl2/main.cpp
+++ b/src/platform/sdl2/main.cpp
@@ -103,6 +103,10 @@ void osJoyVibrate(int index, float L, float R) {
     // TODO
 }
 
+void osToggleVR(bool enable) {
+    // TODO
+}
+
 bool isKeyPressed (SDL_Scancode scancode) {
     const Uint8 *state = SDL_GetKeyboardState(NULL);
     if (state[scancode]) {