diff --git a/strftime.js b/strftime.js
index 8deb8b1..a3420f2 100644
--- a/strftime.js
+++ b/strftime.js
@@ -227,6 +227,12 @@
 
                         // Examples for new Date(0) in GMT
 
+                        // '%'
+                        // case '%':
+                        case 37:
+                            resultString += '%';
+                            break;
+
                         // 'Thursday'
                         // case 'A':
                         case 65: