diff --git a/lib/roken/snprintf.c b/lib/roken/snprintf.c
index 88e996c..022118e 100644
--- a/lib/roken/snprintf.c
+++ b/lib/roken/snprintf.c
@@ -117,6 +117,10 @@ typedef unsigned long u_longest;
 typedef long longest;
 #endif

+#ifndef HAVE_UINTPTR_T
+typedef u_longest uintptr_t;
+#endif
+


 static size_t
@@ -498,7 +502,7 @@ xyzprintf (struct snprintf_state *state, const char *char_format, va_list ap)
                break;
            }
            case 'p' : {
-               u_longest arg = (u_longest)va_arg(ap, void*);
+               uintptr_t arg = (uintptr_t)va_arg(ap, void*);

                len += append_number (state, arg, 0x10, "0123456789ABCDEF",
                                      width, prec, flags, 0);