diff --git a/src/output/output_jpg.h b/src/output/output_jpg.h
index 8df673d0..e47b4d40 100644
--- a/src/output/output_jpg.h
+++ b/src/output/output_jpg.h
@@ -1,4 +1,5 @@
 #include "output_http.h"
+#include <sstream>
 
 namespace Mist{
   class OutJPG : public HTTPOutput{