diff --git a/lib/roken/configure.in b/lib/roken/configure.in
index e9b3bb324..2dcaef66a 100644
--- a/lib/roken/configure.in
+++ b/lib/roken/configure.in
@@ -287,6 +287,7 @@ AC_BROKEN([					\
 	strnlen					\
 	strptime				\
 	strsep					\
+	strsep_copy				\
 	strtok_r				\
 	strupr					\
 	swab					\