diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index d6d6cd176..a9e6ce09e 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -82,6 +82,9 @@
 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
+#ifdef HAVE_ERR_H
+#include <err.h>
+#endif
 #ifdef HAVE_TERMIOS_H
 #include <termios.h>
 #endif