diff --git a/retroshare-gui/src/gui/statistics/Histogram.h b/retroshare-gui/src/gui/statistics/Histogram.h
index ca71d3b82..91ec84b5d 100644
--- a/retroshare-gui/src/gui/statistics/Histogram.h
+++ b/retroshare-gui/src/gui/statistics/Histogram.h
@@ -20,6 +20,7 @@
 
 #include <vector>
 #include <iostream>
+#include <stdint.h>
 
 class QPainter;