diff --git a/include/aws/common/private/system_info_priv.h b/include/aws/common/private/system_info_priv.h
index 81191dc41..d6373a8c0 100644
--- a/include/aws/common/private/system_info_priv.h
+++ b/include/aws/common/private/system_info_priv.h
@@ -1,5 +1,5 @@
-#ifndef AWS_COMMON_SYSTEM_INFO_PRIV_H
-#define AWS_COMMON_SYSTEM_INFO_PRIV_H
+#ifndef AWS_COMMON_PRIVATE_SYSTEM_INFO_PRIV_H
+#define AWS_COMMON_PRIVATE_SYSTEM_INFO_PRIV_H
 /**
  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0.
@@ -33,4 +33,4 @@ int aws_system_environment_load_platform_impl(struct aws_system_environment *env
  */
 void aws_system_environment_destroy_platform_impl(struct aws_system_environment *env);
 
-#endif /* AWS_COMMON_SYSTEM_INFO_PRIV_H */
+#endif // AWS_COMMON_PRIVATE_SYSTEM_INFO_PRIV_H
diff --git a/include/aws/common/system_info.h b/include/aws/common/system_info.h
index a9edfc488..cd3bb944a 100644
--- a/include/aws/common/system_info.h
+++ b/include/aws/common/system_info.h
@@ -7,6 +7,7 @@
  */
 
 #include <aws/common/common.h>
+#include <aws/common/byte_buf.h>
 
 AWS_PUSH_SANE_WARNING_LEVEL