diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index 0afe8e19..6ad231d4 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -1963,7 +1963,7 @@ EXPORT void HWRAPI(CreateModelVBOs) (model_t *model)
 	}
 }
 
-#define BUFFER_OFFSET(i) ((void*)(i))
+#define BUFFER_OFFSET(i) ((char*)(i))
 
 static void DrawModelEx(model_t *model, INT32 frameIndex, INT32 duration, INT32 tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, FSurfaceInfo *Surface)
 {