diff --git a/packages/compiler/package.json b/packages/compiler/package.json
index 9eb5f16..e078dd2 100644
--- a/packages/compiler/package.json
+++ b/packages/compiler/package.json
@@ -54,6 +54,7 @@
   },
   "dependencies": {
     "aphrodite": "^1.2.4",
+    "array-from": "^2.1.1",
     "babel-register": "^6.26.0",
     "clean-css": "^4.1.9",
     "global-cache": "^1.2.1",
diff --git a/packages/compiler/src/utils.js b/packages/compiler/src/utils.js
index f7206df..960f1c3 100644
--- a/packages/compiler/src/utils.js
+++ b/packages/compiler/src/utils.js
@@ -2,6 +2,7 @@ import { JSDOM } from 'jsdom';
 import values from 'object.values';
 import entries from 'object.entries';
 import globalCache from 'global-cache';
+import arrayFrom from 'array-from';
 import { StyleSheetServer, StyleSheet, css as compile } from 'aphrodite/no-important';
 
 import CSSInterface from 'react-with-styles-interface-css';
@@ -38,7 +39,7 @@ function getCSS(stylesObject) {
   entries(stylesObject).forEach(([styleName, styleDef]) => {
     for (let i = 1; i <= maxSpecificity; i += 1) {
       const repeatedSpecifier =
-        Array.from({ length: i }, () => `${styleName}_${i}`).join('.');
+        arrayFrom({ length: i }, () => `${styleName}_${i}`).join('.');
       stylesObjectWithSpecificity[repeatedSpecifier] = styleDef;
     }
   });
diff --git a/packages/interface/package.json b/packages/interface/package.json
index 3915c5c..7e5aee6 100644
--- a/packages/interface/package.json
+++ b/packages/interface/package.json
@@ -49,7 +49,8 @@
   "dependencies": {
     "aphrodite": "^1.2.5",
     "array.prototype.flatten": "^1.2.1",
-    "global-cache": "^1.2.1"
+    "global-cache": "^1.2.1",
+    "object-assign": "^4.1.1"
   },
   "peerDependencies": {
     "react-with-styles": "^3.0.0"
diff --git a/packages/interface/src/utils/separateStyles.js b/packages/interface/src/utils/separateStyles.js
index 138e20e..7934edd 100644
--- a/packages/interface/src/utils/separateStyles.js
+++ b/packages/interface/src/utils/separateStyles.js
@@ -1,3 +1,5 @@
+import assign from 'object-assign';
+
 // This function takes an array of styles and separates them into styles that
 // are handled by Aphrodite and inline styles.
 function separateStyles(stylesArray) {
@@ -23,7 +25,7 @@ function separateStyles(stylesArray) {
       if (typeof style === 'string') {
         classNames.push(style);
       } else {
-        Object.assign(inlineStyles, style);
+        assign(inlineStyles, style);
         hasInlineStyles = true;
       }
     }