diff --git a/include/graphqlservice/internal/Schema.h b/include/graphqlservice/internal/Schema.h
index 661ef00f..bdc87926 100644
--- a/include/graphqlservice/internal/Schema.h
+++ b/include/graphqlservice/internal/Schema.h
@@ -10,7 +10,10 @@
 #include "SortedMap.h"
 #include "Version.h"
 
+#include <memory>
+#include <optional>
 #include <shared_mutex>
+#include <string_view>
 #include <vector>
 
 namespace graphql {