diff --git a/src/generator.js b/src/generator.js
index 0571e5d..2f32c4a 100644
--- a/src/generator.js
+++ b/src/generator.js
@@ -12,8 +12,6 @@ import { maybe, cell_id, is_nil, get_value } from './utils/index';
 import List from './utils/list';
 let { join, make_array, remove_empty_values } = List();
 
-import get_definition from './utils/get-definition';
-
 function is_host_selector(s) {
   return /^\:(host|doodle)/.test(s);
 }
@@ -566,14 +564,6 @@ class Rules {
       });
     });
 
-    let definitions = [];
-    Object.keys(this.custom_properties).forEach(name => {
-      let def = get_definition(name);
-      if (def) {
-        definitions.push(def);
-      }
-    });
-
     return {
       props: this.props,
       styles: this.styles,
@@ -583,7 +573,6 @@ class Rules {
       paths: this.paths,
       canvas: this.canvas,
       pattern: this.pattern,
-      definitions: definitions,
       uniforms: this.uniforms
     }
   }
diff --git a/src/index.js b/src/index.js
index e9f5f85..4a275f1 100644
--- a/src/index.js
+++ b/src/index.js
@@ -406,13 +406,11 @@ class Doodle extends HTMLElement {
     }
 
     // might be removed in the future
-    const definitions = compiled.definitions;
     if (window.CSS && window.CSS.registerProperty) {
       try {
         if (uniforms.time) {
           this.register_uniform_time();
         }
-        definitions.forEach(CSS.registerProperty);
       } catch (e) { }
     }
   }
diff --git a/src/utils/get-definition.js b/src/utils/get-definition.js
deleted file mode 100644
index c8342fb..0000000
--- a/src/utils/get-definition.js
+++ /dev/null
@@ -1,28 +0,0 @@
-const initial = {
-  length: '0px',
-  number: 0,
-  color: 'black',
-  url: 'url()',
-  image: 'url()',
-  integer: 0,
-  angle: '0deg',
-  time: '0ms',
-  resolution: '0dpi',
-  percentage: '0%',
-  'length-percentage': '0%',
-  'transform-function': 'translate(0)',
-  'transform-list': 'translate(0)',
-  'custom-ident': '_'
-};
-
-export default function get_definition(name) {
-  let type = String(name).substr(2).split('-')[0];
-  if (initial[type] !== undefined) {
-    return {
-      name: name,
-      syntax: `<${type}> | <${type}>+ | <${type}>#`,
-      initialValue: initial[type],
-      inherits: false
-    }
-  }
-}