diff --git a/include/zephyr/drivers/i3c.h b/include/zephyr/drivers/i3c.h
index 4e94c890b3b..5d48a360999 100644
--- a/include/zephyr/drivers/i3c.h
+++ b/include/zephyr/drivers/i3c.h
@@ -1189,9 +1189,16 @@ struct i3c_driver_config {
 
 	/** I3C Primary Controller Dynamic Address */
 	uint8_t primary_controller_da;
+#elif defined(CONFIG_CPP)
+       /* Empty struct has size 0 in C, size 1 in C++. Force them to be the same. */
+	uint8_t unused_cpp_size_compatibility;
 #endif
 };
 
+#if defined(CONFIG_CPP)
+BUILD_ASSERT(sizeof(struct i3c_driver_config) >= 1);
+#endif
+
 /**
  * This structure is common to all I3C drivers and is expected to be the first
  * element in the driver's struct driver_data declaration.