diff --git a/lib/libc/stdio/tmpnam.3 b/lib/libc/stdio/tmpnam.3
index f42dc2533dd0..423898c88d63 100644
--- a/lib/libc/stdio/tmpnam.3
+++ b/lib/libc/stdio/tmpnam.3
@@ -78,7 +78,7 @@ past.
 is defined in the include file
 .Aq Pa stdio.h .
 If the argument
-.Fa s
+.Fa str
 is
 .Pf non- Dv NULL ,
 the file name is copied to the buffer it references.
@@ -88,7 +88,7 @@ In either case,
 returns a pointer to the file name.
 .Pp
 The buffer referenced by 
-.Fa s
+.Fa str
 is expected to be at least
 .Dv L_tmpnam
 bytes in length.