diff --git a/grpc/src/compiler/schema_interface.h b/grpc/src/compiler/schema_interface.h
index 332a51a54..e511ff57b 100644
--- a/grpc/src/compiler/schema_interface.h
+++ b/grpc/src/compiler/schema_interface.h
@@ -34,8 +34,9 @@
 #ifndef GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H
 #define GRPC_INTERNAL_COMPILER_SCHEMA_INTERFACE_H
 
- #include <memory>
- #include <vector>
+#include <map>
+#include <memory>
+#include <vector>
 
  #ifndef GRPC_CUSTOM_STRING
  #include <string>