diff --git a/man3/iconv.3 b/man3/iconv.3
index c3c243e3a..b40eca387 100644
--- a/man3/iconv.3
+++ b/man3/iconv.3
@@ -23,8 +23,8 @@ iconv \- perform character set conversion
 .B #include <iconv.h>
 .PP
 .BI "size_t iconv(iconv_t " cd ,
-.BI "             char **" inbuf ", size_t *" inbytesleft ,
-.BI "             char **" outbuf ", size_t *" outbytesleft );
+.BI "             char **restrict " inbuf ", size_t *restrict " inbytesleft ,
+.BI "             char **restrict " outbuf ", size_t *restrict " outbytesleft );
 .fi
 .SH DESCRIPTION
 The