diff --git a/utils/tex2rtf/src/texutils.cpp b/utils/tex2rtf/src/texutils.cpp
index 23d07397f0..be0c83a28c 100644
--- a/utils/tex2rtf/src/texutils.cpp
+++ b/utils/tex2rtf/src/texutils.cpp
@@ -36,6 +36,7 @@
 #else
 #include <iostream>
 #include <fstream>
+using namespace std;
 #endif
 
 #include <ctype.h>