diff --git a/cf/roken-frag.m4 b/cf/roken-frag.m4
index 479f755c6..ae78e7e91 100644
--- a/cf/roken-frag.m4
+++ b/cf/roken-frag.m4
@@ -190,6 +190,7 @@ AC_CHECK_FUNCS([				\
 	setprogname				\
 	setstate				\
 	strsvis					\
+	strsvisx				\
 	strunvis				\
 	strvis					\
 	strvisx					\
@@ -388,7 +389,7 @@ AM_CONDITIONAL(have_fnmatch_h,
 AC_FOREACH([rk_func], [strndup strsep strtok_r],
 	[AC_NEED_PROTO([#include <string.h>], rk_func)])
 
-AC_FOREACH([rk_func], [strsvis strunvis strvis strvisx svis unvis vis],
+AC_FOREACH([rk_func], [strsvis strsvisx strunvis strvis strvisx svis unvis vis],
 [AC_NEED_PROTO([#ifdef HAVE_VIS_H
 #include <vis.h>
 #endif], rk_func)])
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index edea16a8b..bf36c7eff 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -947,6 +947,14 @@ ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 strsvis(char *, const char *, int, const char *);
 #endif
 
+#if !defined(HAVE_STRSVISX) || defined(NEED_STRSVISX_PROTO)
+#ifndef HAVE_STRSVISX
+#define strsvisx rk_strsvisx
+#endif
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+strsvisx(char *, const char *, size_t, int, const char *);
+#endif
+
 #if !defined(HAVE_STRUNVIS) || defined(NEED_STRUNVIS_PROTO)
 #ifndef HAVE_STRUNVIS
 #define strunvis rk_strunvis