diff --git a/src/util.h b/src/util.h
index 3990c85..7d2f865 100644
--- a/src/util.h
+++ b/src/util.h
@@ -16,7 +16,6 @@ licence_t TOlicence(char *s);
 int getopt_long(int argc, char *const argv[], const char *optstring,
 		const struct option *longopts, int *longindex);
 
-char *str_dup(const char *s);
 char *tostrupr(const char *s);
 
 extern int fno;