diff --git a/Gui/DataView/DirectConditionGenerator.h b/Gui/DataView/DirectConditionGenerator.h
index 76de002b6d59b89d67924bbca3c3ef9123975214..25ac9c77e3e161ef908c2a009241c17e95abd8f3 100644
--- a/Gui/DataView/DirectConditionGenerator.h
+++ b/Gui/DataView/DirectConditionGenerator.h
@@ -13,6 +13,7 @@
 #define DIRECTCONDITIONGENERATOR_H
 
 #include <vector>
+#include <string>
 
 namespace MeshLib {
 	class Mesh;