diff --git a/SerialPrograms/Source/ML/DataLabeling/ML_AnnotationIO.cpp b/SerialPrograms/Source/ML/DataLabeling/ML_AnnotationIO.cpp
index c92349ad8d..7c6ce25ba7 100644
--- a/SerialPrograms/Source/ML/DataLabeling/ML_AnnotationIO.cpp
+++ b/SerialPrograms/Source/ML/DataLabeling/ML_AnnotationIO.cpp
@@ -8,6 +8,7 @@
 #include <fstream>
 #include <iostream>
 #include <map>
+#include <sstream>
 #include <QDirIterator>
 #include <QDir>
 #include <QMessageBox>