diff --git a/Fwk/AppFwk/cafProjectDataModel/cafPdmCore/cafAssert.h b/Fwk/AppFwk/cafProjectDataModel/cafPdmCore/cafAssert.h
index 440497aed4..2120fd5ad3 100644
--- a/Fwk/AppFwk/cafProjectDataModel/cafPdmCore/cafAssert.h
+++ b/Fwk/AppFwk/cafProjectDataModel/cafPdmCore/cafAssert.h
@@ -2,6 +2,7 @@
 #pragma once
 
 #include <iostream>
+#include <cstdlib>
 
 #define CAF_ASSERT(expr)                                             \
   do                                                                 \