diff --git a/packages/material-ui/src/FormControlLabel/FormControlLabel.js b/packages/material-ui/src/FormControlLabel/FormControlLabel.js
index bc8fc9e4a43904..c7e4abcd499e94 100644
--- a/packages/material-ui/src/FormControlLabel/FormControlLabel.js
+++ b/packages/material-ui/src/FormControlLabel/FormControlLabel.js
@@ -22,8 +22,8 @@ export const styles = theme => ({
       cursor: 'default',
     },
   },
-  /* Styles applied to the root element if `position="start"`. */
-  start: {
+  /* Styles applied to the root element if `labelPlacement="start"`. */
+  labelPlacementStart: {
     flexDirection: 'row-reverse',
   },
   /* Styles applied to the root element if `disabled={true}`. */
@@ -79,7 +79,7 @@ function FormControlLabel(props, context) {
       className={classNames(
         classes.root,
         {
-          [classes.start]: labelPlacement === 'start',
+          [classes.labelPlacementStart]: labelPlacement === 'start',
           [classes.disabled]: disabled,
         },
         classNameProp,
diff --git a/packages/material-ui/src/FormControlLabel/FormControlLabel.test.js b/packages/material-ui/src/FormControlLabel/FormControlLabel.test.js
index d60826e79d8efc..0b68f544ac46b3 100644
--- a/packages/material-ui/src/FormControlLabel/FormControlLabel.test.js
+++ b/packages/material-ui/src/FormControlLabel/FormControlLabel.test.js
@@ -60,7 +60,7 @@ describe('<FormControlLabel />', () => {
       const wrapper = shallow(
         <FormControlLabel label="Pizza" labelPlacement="start" control={<div />} />,
       );
-      assert.strictEqual(wrapper.hasClass(classes.start), true);
+      assert.strictEqual(wrapper.hasClass(classes.labelPlacementStart), true);
     });
   });
 
diff --git a/pages/api/form-control-label.md b/pages/api/form-control-label.md
index f78f891c64773c..908018a2de76ee 100644
--- a/pages/api/form-control-label.md
+++ b/pages/api/form-control-label.md
@@ -38,7 +38,7 @@ This property accepts the following keys:
 | Name | Description |
 |:-----|:------------|
 | <span class="prop-name">root</span> | Styles applied to the root element.
-| <span class="prop-name">start</span> | Styles applied to the root element if `position="start"`.
+| <span class="prop-name">labelPlacementStart</span> | Styles applied to the root element if `labelPlacement="start"`.
 | <span class="prop-name">disabled</span> | Styles applied to the root element if `disabled={true}`.
 | <span class="prop-name">label</span> | Styles applied to the label's Typography component.