diff --git a/Number_types/test/Number_types/to_interval_test.cpp b/Number_types/test/Number_types/to_interval_test.cpp
index 59752059bf6..553199db0a0 100644
--- a/Number_types/test/Number_types/to_interval_test.cpp
+++ b/Number_types/test/Number_types/to_interval_test.cpp
@@ -16,6 +16,11 @@
 #include <CGAL/Gmpz.h>
 #endif
 
+
+#include <CGAL/float.h>
+#include <CGAL/double.h>
+#include <CGAL/int.h>
+
 #if 0
 #ifdef CGAL_USE_CLN
 #include <CGAL/CLN/cl_integer.h>