diff --git a/lib/des/key_par.c b/lib/des/key_par.c
index 6004fc622..827d91e4a 100644
--- a/lib/des/key_par.c
+++ b/lib/des/key_par.c
@@ -4,7 +4,7 @@
 
 #ifdef des_fixup_key_parity
 #undef des_fixup_key_parity
-#endif des_fixup_key_parity
+#endif /* des_fixup_key_parity */
 
 void
 des_fixup_key_parity(des_cblock *key)