diff --git a/src/simulator/high-precision-cairo.h b/src/simulator/high-precision-cairo.h
index 4bcff892d..3d5ab42f4 100644
--- a/src/simulator/high-precision-cairo.h
+++ b/src/simulator/high-precision-cairo.h
@@ -22,6 +22,7 @@
 
 #include <stdint.h>
 #include <math.h>
+#include <iostream>
 #include "cairo-wideint-private.h"
 
 /**