diff --git a/configure.ac b/configure.ac
index 6d74a26..6b5742c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -248,6 +248,8 @@ AC_FUNC_VPRINTF
 
 AC_C_BIGENDIAN
 
+AC_TYPE_LONG_LONG_INT
+
 dnl for each function found we get a definition in config.h 
 dnl of the form HAVE_FUNCTION