diff --git a/man3/random_r.3 b/man3/random_r.3
index 5363e5e78..882ba83a2 100644
--- a/man3/random_r.3
+++ b/man3/random_r.3
@@ -31,12 +31,14 @@ random number generator
 .nf
 .B #include <stdlib.h>
 .PP
-.BI "int random_r(struct random_data *" buf ", int32_t *" result );
+.BI "int random_r(struct random_data *restrict " buf ,
+.BI "             int32_t *restrict " result );
 .BI "int srandom_r(unsigned int " seed ", struct random_data *" buf );
 .PP
-.BI "int initstate_r(unsigned int " seed ", char *" statebuf ,
-.BI "                size_t " statelen ", struct random_data *" buf );
-.BI "int setstate_r(char *" statebuf ", struct random_data *" buf );
+.BI "int initstate_r(unsigned int " seed ", char *restrict " statebuf ,
+.BI "             size_t " statelen ", struct random_data *restrict " buf );
+.BI "int setstate_r(char *restrict " statebuf ,
+.BI "             struct random_data *restrict " buf );
 .fi
 .PP
 .RS -4