diff --git a/index.js b/index.js
index a0ecbb4..3a2d73d 100644
--- a/index.js
+++ b/index.js
@@ -146,7 +146,7 @@ Depper.prototype.add = function(filename, done) {
   return dep
 
   function extractPreprocessors() {
-    var tokens = tokenize(dep.source)
+    var tokens = tokenize(dep.source, { version: '300 es' })
 
     for (var i = 0; i < tokens.length; i++) {
       var token = tokens[i]
diff --git a/package-lock.json b/package-lock.json
index 0064aea..c6094a7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,1254 @@
 {
   "name": "glslify-deps",
-  "version": "1.3.0",
-  "lockfileVersion": 1,
+  "version": "1.3.2",
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "version": "1.3.2",
+      "license": "ISC",
+      "dependencies": {
+        "@choojs/findup": "^0.2.0",
+        "events": "^3.2.0",
+        "glsl-resolve": "0.0.1",
+        "glsl-tokenizer": "^2.0.0",
+        "graceful-fs": "^4.1.2",
+        "inherits": "^2.0.1",
+        "map-limit": "0.0.1",
+        "resolve": "^1.0.0"
+      },
+      "devDependencies": {
+        "glsl-random": "0.0.4",
+        "glslify-hex": "^2.0.0",
+        "istanbul": "^0.3.5",
+        "tap-spec": "^4.1.1",
+        "tape": "^3.0.2"
+      }
+    },
+    "node_modules/@choojs/findup": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/@choojs/findup/-/findup-0.2.0.tgz",
+      "integrity": "sha512-jG8+ezKlhXaigbCTxLJas1uMB/3PCXZ/VxvtVys1M+eBE4L5swy9FX0ox1jSuTxUHjwcxnOI7lBS7vDNja9mDg==",
+      "dependencies": {
+        "commander": "^2.15.1"
+      },
+      "bin": {
+        "findup": "bin/findup.js"
+      }
+    },
+    "node_modules/abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "node_modules/align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/amdefine": {
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+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.4.2"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "dependencies": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "node_modules/async": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+      "dev": true
+    },
+    "node_modules/balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "node_modules/brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/camelcase": {
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+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+      "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+      "dev": true,
+      "optional": true,
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
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+        "lazy-cache": "^1.0.3"
+      },
+      "engines": {
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+      }
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+    "node_modules/chalk": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
+      },
+      "engines": {
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+      }
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+      "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+      "dev": true,
+      "engines": {
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+    "node_modules/cliui": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
+      "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
+        "center-align": "^0.1.1",
+        "right-align": "^0.1.1",
+        "wordwrap": "0.0.2"
+      }
+    },
+    "node_modules/cliui/node_modules/wordwrap": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+      "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+      "dev": true,
+      "optional": true,
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/commander": {
+      "version": "2.15.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
+      "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag=="
+    },
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+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
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+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
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+        "esgenerate": "bin/esgenerate.js"
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+        "esvalidate": "bin/esvalidate.js"
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