diff --git a/include/llmr/style/style_source.hpp b/include/llmr/style/style_source.hpp
index e7b742abb..a368e4fd7 100644
--- a/include/llmr/style/style_source.hpp
+++ b/include/llmr/style/style_source.hpp
@@ -3,6 +3,8 @@
 
 #include <llmr/style/types.hpp>
 
+#include <memory>
+
 namespace llmr {
 
 class Source;