diff --git a/retry b/retry
index 5d02128..86d17a9 100755
--- a/retry
+++ b/retry
@@ -1,10 +1,10 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 GETOPT_BIN=$IN_GETOPT_BIN
 GETOPT_BIN=${GETOPT_BIN:-getopt}
 
 __sleep_amount() {
-  if [ -n "$constant_sleep" ]; then 
+  if [ -n "$constant_sleep" ]; then
     sleep_time=$constant_sleep
   else
     #TODO: check for awk