diff --git a/man3/getprotoent_r.3 b/man3/getprotoent_r.3
index 55e37d0c9..651ec00c2 100644
--- a/man3/getprotoent_r.3
+++ b/man3/getprotoent_r.3
@@ -31,14 +31,17 @@ protocol entry (reentrant)
 .nf
 .B #include <netdb.h>
 .PP
-.BI "int getprotoent_r(struct protoent *" result_buf ", char *" buf ,
-.BI "                size_t " buflen ", struct protoent **" result );
-.BI "int getprotobyname_r(const char *" name ,
-.BI "                struct protoent *" result_buf ", char *" buf ,
-.BI "                size_t " buflen ", struct protoent **" result );
+.BI "int getprotoent_r(struct protoent *restrict " result_buf ,
+.BI "                  char *restrict " buf ", size_t " buflen ,
+.BI "                  struct protoent **restrict " result );
+.BI "int getprotobyname_r(const char *restrict " name ,
+.BI "                  struct protoent *restrict " result_buf ,
+.BI "                  char *restrict " buf ", size_t " buflen ,
+.BI "                  struct protoent **restrict " result );
 .BI "int getprotobynumber_r(int " proto ,
-.BI "                struct protoent *" result_buf ", char *" buf ,
-.BI "                size_t " buflen ", struct protoent **" result );
+.BI "                  struct protoent *restrict " result_buf ,
+.BI "                  char *restrict " buf ", size_t " buflen ,
+.BI "                  struct protoent **restrict " result );
 .PP
 .fi
 .RS -4