diff --git a/src/main/kotlin/com/beust/kobalt/misc/ToString.kt b/src/main/kotlin/com/beust/kobalt/misc/ToString.kt
index f1c38a3f..41c38b23 100644
--- a/src/main/kotlin/com/beust/kobalt/misc/ToString.kt
+++ b/src/main/kotlin/com/beust/kobalt/misc/ToString.kt
@@ -3,9 +3,11 @@ package com.beust.kobalt.misc
 fun <T> toString(name: String, vararg o: T) : String {
     val sb = StringBuilder()
 
-    for (i in 0..o.size - 1 step 2) {
+    var i = 0
+    while (i < o.size) {
         if (i > 0) sb.append(", ")
         sb.append(o[i].toString() + ":" + o[i + 1])
+        i += 2
     }
     return "{$name $sb}"
 }