diff --git a/man2/pkey_alloc.2 b/man2/pkey_alloc.2
index e2a5fb87e..bd1c6e0b6 100644
--- a/man2/pkey_alloc.2
+++ b/man2/pkey_alloc.2
@@ -29,7 +29,7 @@ pkey_alloc, pkey_free \- allocate or free a protection key
 .nf
 .B #include <sys/mman.h>
 .PP
-.BI "int pkey_alloc(unsigned long " flags ", unsigned long " access_rights ");"
+.BI "int pkey_alloc(unsigned int " flags ", unsigned int " access_rights ");"
 .BI "int pkey_free(int " pkey ");"
 .fi
 .SH DESCRIPTION