diff --git a/lib/roken/strtok_r.c b/lib/roken/strtok_r.c
index 66ab0b553..b0d11ffe8 100644
--- a/lib/roken/strtok_r.c
+++ b/lib/roken/strtok_r.c
@@ -45,6 +45,8 @@ RCSID("$Id$");
 
 #include "roken.h"
 
+#ifndef HAVE_STRTOK_R
+
 char *
 strtok_r(char *s1, const char *s2, char **lasts)
 {
@@ -65,3 +67,4 @@ strtok_r(char *s1, const char *s2, char **lasts)
   return ret;
 }
 
+#endif /* HAVE_STRTOK_R */