diff --git a/util/mkdef.pl b/util/mkdef.pl
index 29cbe7dbc0..dcd622429f 100755
--- a/util/mkdef.pl
+++ b/util/mkdef.pl
@@ -258,6 +258,8 @@ $ssl.=" ssl/tls1.h";
 
 my $crypto ="crypto/crypto.h";
 $crypto.=" crypto/o_dir.h";
+$crypto.=" crypto/o_str.h";
+$crypto.=" crypto/o_time.h";
 $crypto.=" crypto/des/des.h crypto/des/des_old.h" ; # unless $no_des;
 $crypto.=" crypto/idea/idea.h" ; # unless $no_idea;
 $crypto.=" crypto/rc4/rc4.h" ; # unless $no_rc4;