diff --git a/material-ui/material-ui-tests.tsx b/material-ui/material-ui-tests.tsx
index 0aa2162dd..d4dd110d3 100644
--- a/material-ui/material-ui-tests.tsx
+++ b/material-ui/material-ui-tests.tsx
@@ -54,7 +54,7 @@ class MaterialUiTests extends React.Component<{}, {}> implements React.LinkedSta
     render() {
 
         // "http://material-ui.com/#/customization/themes"
-        let ThemeManager = new mui.Styles.ThemeManager();
+        let ThemeManager = mui.Styles.ThemeManager;
         let muiTheme: mui.Styles.MuiTheme = ThemeManager.getMuiTheme({
             palette: {
                 accent1Color: Colors.cyan100
diff --git a/material-ui/material-ui.d.ts b/material-ui/material-ui.d.ts
index a45448133..ae6953fe3 100644
--- a/material-ui/material-ui.d.ts
+++ b/material-ui/material-ui.d.ts
@@ -1051,12 +1051,13 @@ declare namespace __MaterialUI {
 
         export function ThemeDecorator(muiTheme: Styles.MuiTheme): <P>(Component: React.ComponentClass<P>) => React.ComponentClass<P>;
 
-        export class ThemeManager {
+        interface ThemeManager {
             getMuiTheme(rawTheme: RawTheme): MuiTheme;
             modifyRawThemeSpacing(muiTheme: MuiTheme, newSpacing: Spacing): MuiTheme;
             modifyRawThemePalette(muiTheme: MuiTheme, newPaletteKeys: ThemePalette): MuiTheme;
             modifyRawThemeFontFamily(muiTheme: MuiTheme, newFontFamily: string): MuiTheme;
         }
+        export var ThemeManager: ThemeManager;
 
         interface Transitions {
             easeOut(duration?: string, property?: string | string[], delay?: string, easeFunction?: string): string;