diff --git a/src/ini_type.h b/src/ini_type.h
index aefa0a5e64..d2166a7e20 100644
--- a/src/ini_type.h
+++ b/src/ini_type.h
@@ -12,6 +12,8 @@
 
 #include "fileio_type.h"
 
+#include <string>
+
 /** Types of groups */
 enum IniGroupType {
 	IGT_VARIABLES = 0, ///< Values of the form "landscape = hilly".