diff --git a/index.js b/index.js
index b1f20f8..b7d2e98 100644
--- a/index.js
+++ b/index.js
@@ -5,11 +5,21 @@ var descope  = require('glsl-token-descope')
 var string   = require('glsl-token-string')
 var scope    = require('glsl-token-scope')
 var depth    = require('glsl-token-depth')
+var btoa     = require('btoa-lite')
 
 module.exports = function(deps) {
-  return inject(Bundle(deps).src, {
+  var defs = {
     GLSLIFY: 1
-  })
+  }
+
+  for (var i = 0; i < deps.length; i++) {
+    if (deps[i].entry && deps[i].file) {
+      defs.SHADER_NAME_B64 = btoa(deps[i].file)
+      break
+    }
+  }
+
+  return inject(Bundle(deps).src, defs)
 }
 
 function Bundle(deps) {
diff --git a/package.json b/package.json
index cf9f6e0..17aa2b7 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
     "url": "http://hughsk.io/"
   },
   "dependencies": {
+    "btoa-lite": "^1.0.0",
     "glsl-inject-defines": "^1.0.1",
     "glsl-token-defines": "^1.0.0",
     "glsl-token-depth": "^1.1.1",