diff --git a/lib/libc/string/strdup.3 b/lib/libc/string/strdup.3
index db5a11025dc3..881dcdb6a9e7 100644
--- a/lib/libc/string/strdup.3
+++ b/lib/libc/string/strdup.3
@@ -91,7 +91,7 @@ function is specified by
 The
 .Fn strdup
 function first appeared in
-.Bx 4.4 .
+.Bx 4.3 Reno .
 The
 .Fn strndup
 function was added in