diff --git a/libisofs/filters/zisofs.c b/libisofs/filters/zisofs.c
index f9e9c11..1e99f66 100644
--- a/libisofs/filters/zisofs.c
+++ b/libisofs/filters/zisofs.c
@@ -941,7 +941,7 @@ int ziso_create_context(FilterContext **filter, int flag)
     return ISO_SUCCESS;
 }
 
-#endif Libisofs_with_zliB
+#endif /* Libisofs_with_zliB */
 
 /*
  * @param flag bit0= if_block_reduction rather than if_reduction