diff --git a/man3/assert.3 b/man3/assert.3
index 41cd78b7d..abdf38f92 100644
--- a/man3/assert.3
+++ b/man3/assert.3
@@ -70,7 +70,7 @@ T}	Thread safety	MT-Safe
 .TE
 
 .SH CONFORMING TO
-POSIX.1-2001, C89, C99.
+POSIX.1-2001, POSIX.1-2008, C89, C99.
 In C89,
 .I expression
 is required to be of type