diff --git a/lib/des/key_par.c b/lib/des/key_par.c
new file mode 100644
index 000000000..6004fc622
--- /dev/null
+++ b/lib/des/key_par.c
@@ -0,0 +1,13 @@
+#include "des_locl.h"
+
+/* MIT Link and source compatibility */
+
+#ifdef des_fixup_key_parity
+#undef des_fixup_key_parity
+#endif des_fixup_key_parity
+
+void
+des_fixup_key_parity(des_cblock *key)
+{
+  des_set_odd_parity(key);
+}