diff --git a/src/sfizz/modulations/ModMatrix.h b/src/sfizz/modulations/ModMatrix.h
index 516052ae..fa1f2633 100644
--- a/src/sfizz/modulations/ModMatrix.h
+++ b/src/sfizz/modulations/ModMatrix.h
@@ -6,6 +6,7 @@
 
 #pragma once
 #include "../NumericId.h"
+#include <string>
 #include <memory>
 #include <cstdint>