diff --git a/simulator/simulator/global.h b/simulator/simulator/global.h
index b9ee374466..de233d651a 100644
--- a/simulator/simulator/global.h
+++ b/simulator/simulator/global.h
@@ -5,6 +5,7 @@
 #include <hal.h>
 #include <time.h>
 #include <math.h>
+#include <float.h>
 
 #include "efifeatures.h"