diff --git a/lib/layouts.js b/lib/layouts.js
index 6cf412d1..76231faf 100644
--- a/lib/layouts.js
+++ b/lib/layouts.js
@@ -156,16 +156,19 @@ function patternLayout(pattern, tokens) {
           break;
         case 'ABSOLUTE':
           debug("DEPRECATION: Pattern %d{ABSOLUTE} is deprecated and replaced by %d{ABSOLUTETIME}.");
+          // falls through
         case 'ABSOLUTETIME':
         case 'ABSOLUTETIME_FORMAT':
           format = dateFormat.ABSOLUTETIME_FORMAT;
           break;
         case 'DATE':
           debug("DEPRECATION: Pattern %d{DATE} is deprecated and replaced by %d{DATETIME}.");
+          // falls through
         case 'DATETIME':
         case 'DATETIME_FORMAT':
           format = dateFormat.DATETIME_FORMAT;
           break;
+        // no default
       }
     }
     // Format the date