diff --git a/sys/dev/drm2/i915/i915_gem_context.c b/sys/dev/drm2/i915/i915_gem_context.c
index 3e9797c..f55816b 100644
--- a/sys/dev/drm2/i915/i915_gem_context.c
+++ b/sys/dev/drm2/i915/i915_gem_context.c
@@ -134,8 +134,10 @@ static int get_context_size(struct drm_device *dev)
 
 static void do_destroy(struct i915_hw_context *ctx)
 {
+#if defined(INVARIANTS)
 	struct drm_device *dev = ctx->obj->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+#endif
 
 	if (ctx->file_priv)
 		drm_gem_names_remove(&ctx->file_priv->context_idr, ctx->id);