diff --git a/include/flow/graphviz_builder.hpp b/include/flow/graphviz_builder.hpp
index 5f9d5c55..96b524d3 100644
--- a/include/flow/graphviz_builder.hpp
+++ b/include/flow/graphviz_builder.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <flow/detail/walk.hpp>
 
 #include <stdx/tuple_algorithms.hpp>
diff --git a/include/log/catalog/builder.hpp b/include/log/catalog/builder.hpp
index 8a05bf3d..b57de704 100644
--- a/include/log/catalog/builder.hpp
+++ b/include/log/catalog/builder.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <log/catalog/mipi_builder.hpp>
 
 #include <stdx/compiler.hpp>