diff --git a/Applications/FileIO/GocadIO/GocadAsciiReader.h b/Applications/FileIO/GocadIO/GocadAsciiReader.h
index 90b76c282adcace2967c710267216d6af82277e1..e6d4440c1eb2b3fd119c332cc1de2a0c99edac43 100644
--- a/Applications/FileIO/GocadIO/GocadAsciiReader.h
+++ b/Applications/FileIO/GocadIO/GocadAsciiReader.h
@@ -11,6 +11,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "Applications/FileIO/GocadIO/GocadEnums.h"