diff --git a/man3/putpwent.3 b/man3/putpwent.3
index 4db31a78d..85caca9c7 100644
--- a/man3/putpwent.3
+++ b/man3/putpwent.3
@@ -36,7 +36,8 @@ putpwent \- write a password file entry
 .B #include <sys/types.h>
 .B #include <pwd.h>
 .PP
-.BI "int putpwent(const struct passwd *" p ", FILE *" stream );
+.BI "int putpwent(const struct passwd *restrict " p \
+", FILE *restrict " stream );
 .fi
 .PP
 .RS -4