diff --git a/include/boost/cstdint.hpp b/include/boost/cstdint.hpp
index 20678c5..6f65b90 100644
--- a/include/boost/cstdint.hpp
+++ b/include/boost/cstdint.hpp
@@ -35,7 +35,7 @@
       // this is triggered with GCC, because it defines __cplusplus < 199707L
 #     define BOOST_NO_INT64_T
 #   endif 
-# elif defined(__FreeBSD__)
+# elif defined(__FreeBSD__) || defined(__IBMCPP__)
 #   include <inttypes.h>
 # else
 #   include <stdint.h>