sanity fix
diff --git a/include/grpc/support/workaround_list.h b/include/grpc/support/workaround_list.h
index dceaa5f..6a8aa1f 100644
--- a/include/grpc/support/workaround_list.h
+++ b/include/grpc/support/workaround_list.h
@@ -31,6 +31,9 @@
*
*/
+#ifndef GRPC_SUPPORT_WORKAROUND_LIST_H
+#define GRPC_SUPPORT_WORKAROUND_LIST_H
+
/* The list of IDs of server workarounds currently maintained by gRPC. For
* explanation and detailed descriptions of workarounds, see
* /docs/workarounds.md
@@ -39,3 +42,5 @@
GRPC_WORKAROUND_ID_CRONET_COMPRESSION = 0,
GRPC_MAX_WORKAROUND_ID
} grpc_workaround_list;
+
+#endif