diff --git a/bash/b64 b/bash/b64
old mode 100644
new mode 100755
index 02a2025..46514ee
--- a/bash/b64
+++ b/bash/b64
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 b64_encode() {
   local idx=0 numerics table_idxs table_idx encoded
   local table=( {A..Z} {a..z} {0..9} + / )