diff --git a/util/mkdef.pl b/util/mkdef.pl
index c7160036f06bc0745f3910136f4dbee2e88ab615..409a39019f94a26871b337b3e85a1bc63a3c4bfd 100755
--- a/util/mkdef.pl
+++ b/util/mkdef.pl
@@ -295,6 +295,7 @@ $crypto.=" include/openssl/srp.h";
 $crypto.=" include/openssl/modes.h";
 $crypto.=" include/openssl/async.h";
 $crypto.=" include/openssl/ct.h";
+$crypto.=" include/openssl/kdf.h";
 
 my $symhacks="include/openssl/symhacks.h";