diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 8c855d7a8..95d720dd6 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -37,6 +37,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
 #include <string.h>
 #include <signal.h>
 
@@ -138,6 +141,12 @@ typedef int ssize_t;
 
 ROKEN_CPP_START
 
+#ifdef HAVE_UINTPTR_T
+#define rk_UNCONST(x) ((void *)(uintptr_t)(const void *)(x))
+#else
+#define rk_UNCONST(x) ((void *)(unsigned long)(const void *)(x))
+#endif
+
 #if !defined(HAVE_SETSID) && defined(HAVE__SETSID)
 #define setsid _setsid
 #endif