diff --git a/lib/libc/gen/rfork_thread.3 b/lib/libc/gen/rfork_thread.3
index 56e01a06469..e985e1c99e7 100644
--- a/lib/libc/gen/rfork_thread.3
+++ b/lib/libc/gen/rfork_thread.3
@@ -35,7 +35,7 @@
 .Lb libc
 .Sh SYNOPSIS
 .In unistd.h
-.Ft int
+.Ft pid_t
 .Fn rfork_thread "int flags" "void *stack" "int (*func)(void *arg)" "void *arg"
 .Sh DESCRIPTION
 The