diff --git a/common/changes/office-ui-fabric-react/FirstBug_2018-03-05-22-47.json b/common/changes/office-ui-fabric-react/FirstBug_2018-03-05-22-47.json
new file mode 100644
index 0000000000000..e7556ba101c95
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/FirstBug_2018-03-05-22-47.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "Facepile: Conditionally apply `aria-describedby` only when `ariaDescription` is provided",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "adrum@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/Facepile/Facepile.tsx b/packages/office-ui-fabric-react/src/components/Facepile/Facepile.tsx
index 2270fc6e2b400..042e96e63df26 100644
--- a/packages/office-ui-fabric-react/src/components/Facepile/Facepile.tsx
+++ b/packages/office-ui-fabric-react/src/components/Facepile/Facepile.tsx
@@ -48,6 +48,7 @@ export class Facepile extends BaseComponent<IFacepileProps, {}> {
   public render(): JSX.Element {
     let { overflowButtonProps } = this.props;
     const {
+      ariaDescription,
       chevronButtonProps,
       maxDisplayablePersonas,
       className,
@@ -69,7 +70,7 @@ export class Facepile extends BaseComponent<IFacepileProps, {}> {
           { showAddButton ? this._getAddNewElement() : null }
           { this.onRenderAriaDescription() }
           <FocusZone
-            ariaDescribedBy={ this._ariaDescriptionId }
+            ariaDescribedBy={ ariaDescription && this._ariaDescriptionId }
             role='listbox'
             className={ css('ms-Facepile-members', styles.members) }
             direction={ FocusZoneDirection.horizontal }
diff --git a/packages/office-ui-fabric-react/src/components/Facepile/__snapshots__/Facepile.test.tsx.snap b/packages/office-ui-fabric-react/src/components/Facepile/__snapshots__/Facepile.test.tsx.snap
index f247cc1b3709e..c1be4d56cbdd8 100644
--- a/packages/office-ui-fabric-react/src/components/Facepile/__snapshots__/Facepile.test.tsx.snap
+++ b/packages/office-ui-fabric-react/src/components/Facepile/__snapshots__/Facepile.test.tsx.snap
@@ -8,7 +8,7 @@ exports[`Facepile renders Facepile correctly 1`] = `
     className="ms-Facepile-itemContainer"
   >
     <div
-      aria-describedby="id__0"
+      aria-describedby={undefined}
       aria-labelledby={undefined}
       className="ms-FocusZone ms-Facepile-members"
       data-focuszone-id="FocusZone1"
diff --git a/packages/office-ui-fabric-react/src/components/Facepile/examples/Facepile.Basic.Example.tsx b/packages/office-ui-fabric-react/src/components/Facepile/examples/Facepile.Basic.Example.tsx
index 23744c0c47153..1796e3f08da4a 100644
--- a/packages/office-ui-fabric-react/src/components/Facepile/examples/Facepile.Basic.Example.tsx
+++ b/packages/office-ui-fabric-react/src/components/Facepile/examples/Facepile.Basic.Example.tsx
@@ -43,7 +43,7 @@ export class FacepileBasicExample extends React.Component<{}, IFacepileBasicExam
 
     return (
       <div className={ 'ms-FacepileExample' }>
-        <Facepile {...facepileProps} />
+        <Facepile { ...facepileProps } />
         <div className={ 'control' }>
           <Slider
             label='Number of Personas:'