diff --git a/lib/cipherModes.js b/lib/cipherModes.js
index 339915cc..67277efc 100644
--- a/lib/cipherModes.js
+++ b/lib/cipherModes.js
@@ -446,6 +446,9 @@ modes.ctr.prototype.start = function(options) {
   // use IV as first input
   this._iv = transformIV(options.iv, this.blockSize);
   this._inBlock = this._iv.slice(0);
+  if(options.counter) {
+    inc32(this._inBlock, options.counter);
+  }
   this._partialBytes = 0;
 };
 
@@ -988,9 +991,9 @@ function transformIV(iv, blockSize) {
   return iv;
 }
 
-function inc32(block) {
+function inc32(block, count) {
   // increment last 32 bits of block only
-  block[block.length - 1] = (block[block.length - 1] + 1) & 0xFFFFFFFF;
+  block[block.length - 1] = (block[block.length - 1] + (count || 1)) & 0xFFFFFFFF;
 }
 
 function from64To32(num) {