diff --git a/src/CoolPropTools.cpp b/src/CoolPropTools.cpp
index 2bda2e11..4207a734 100644
--- a/src/CoolPropTools.cpp
+++ b/src/CoolPropTools.cpp
@@ -12,6 +12,7 @@
 #include "CoolPropTools.h"
 #include "MatrixMath.h"
 #include "Exceptions.h"
+#include "crossplatform_shared_ptr.h"
 
 #if !defined(__ISWINDOWS__)
 #include <ftw.h>