diff --git a/src/main.js b/src/main.js
index 55f641f7..1176f63a 100644
--- a/src/main.js
+++ b/src/main.js
@@ -210,7 +210,7 @@ String.chr_repeat = function(chr, count)
 {
     var result = "";
 
-    while(count--)
+    while(count-- > 0)
     {
         result += chr;
     }