diff --git a/arch/sandbox/include/asm/i2c.h b/arch/sandbox/include/asm/i2c.h
new file mode 100644
index 0000000..b482be4
--- /dev/null
+++ b/arch/sandbox/include/asm/i2c.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __asn_i2c_h
+#define __asn_i2c_h
+
+struct sandbox_i2c_priv {
+	bool test_mode;
+};
+
+#endif /* __asn_i2c_h */