diff --git a/lib/roken/err.h b/lib/roken/err.h
index f9c8aeb3e..e74f5d3b4 100644
--- a/lib/roken/err.h
+++ b/lib/roken/err.h
@@ -33,6 +33,6 @@ void warn(const char *fmt, ...)
 void vwarnx(const char *fmt, va_list ap)
      __attribute__ ((format (printf, 1, 0)));
 void warnx(const char *fmt, ...)
-     __attribute__ ((format (printf, 1, 2)));;
+     __attribute__ ((format (printf, 1, 2)));
 
 #endif /* __ERR_H__ */
diff --git a/lib/roken/err.hin b/lib/roken/err.hin
index f9c8aeb3e..e74f5d3b4 100644
--- a/lib/roken/err.hin
+++ b/lib/roken/err.hin
@@ -33,6 +33,6 @@ void warn(const char *fmt, ...)
 void vwarnx(const char *fmt, va_list ap)
      __attribute__ ((format (printf, 1, 0)));
 void warnx(const char *fmt, ...)
-     __attribute__ ((format (printf, 1, 2)));;
+     __attribute__ ((format (printf, 1, 2)));
 
 #endif /* __ERR_H__ */