diff --git a/tools/solidityUpgrade/SourceUpgrade.cpp b/tools/solidityUpgrade/SourceUpgrade.cpp
index 7c70b1d16..b98b050d6 100644
--- a/tools/solidityUpgrade/SourceUpgrade.cpp
+++ b/tools/solidityUpgrade/SourceUpgrade.cpp
@@ -26,6 +26,8 @@
 #include <boost/filesystem/operations.hpp>
 #include <boost/algorithm/string.hpp>
 
+#include <fstream>
+
 #ifdef _WIN32 // windows
 	#include <io.h>
 	#define isatty _isatty