diff --git a/source/ArmarXGui/libraries/ArmarXGuiBase/widgets/cpp-markdown/markdown-tokens.cpp b/source/ArmarXGui/libraries/ArmarXGuiBase/widgets/cpp-markdown/markdown-tokens.cpp
index b82583508f31f67a800700b8062872044a1e6732..7e9506265623df8afde85040c1649ea1015c852e 100644
--- a/source/ArmarXGui/libraries/ArmarXGuiBase/widgets/cpp-markdown/markdown-tokens.cpp
+++ b/source/ArmarXGui/libraries/ArmarXGuiBase/widgets/cpp-markdown/markdown-tokens.cpp
@@ -7,12 +7,11 @@
 
 #include "markdown-tokens.h"
 
-
 #include <boost/regex.hpp>
 
 #include <stack>
 #include <set>
-
+#include <sstream>
 
 namespace markdown::token
 {