diff --git a/Device/Data/Datafield.h b/Device/Data/Datafield.h
index ba13978036064523ba928fb1a128b902f2d071d3..6c9f37109efdf4e27ff14b66c9468222d8761547 100644
--- a/Device/Data/Datafield.h
+++ b/Device/Data/Datafield.h
@@ -19,6 +19,7 @@
 #include "PyCore/Embed/PyObjectDecl.h"
 #endif
 #include <memory>
+#include <string>
 #include <vector>
 using std::size_t;