diff --git a/lib/roken/strnlen.c b/lib/roken/strnlen.c
new file mode 100644
index 000000000..6c53b85d7
--- /dev/null
+++ b/lib/roken/strnlen.c
@@ -0,0 +1,15 @@
+/* Copyright 1996 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif
+
+int
+strnlen(char *s, int len)
+{
+    int i;
+    for(i = 0; i < len && s[i]; i++)
+	;
+    return i;
+}