diff --git a/src/AIModel/AIStorm.cxx b/src/AIModel/AIStorm.cxx
index 15d8c4fe3..a4f2c4543 100644
--- a/src/AIModel/AIStorm.cxx
+++ b/src/AIModel/AIStorm.cxx
@@ -29,6 +29,7 @@
 #include <string>
 #include <math.h>
 #include <cstdlib>
+#include <time.h>
 
 SG_USING_STD(string);