diff --git a/common/changes/office-ui-fabric-react/aria-selected_2018-03-02-01-49.json b/common/changes/office-ui-fabric-react/aria-selected_2018-03-02-01-49.json
new file mode 100644
index 00000000000000..a2574c21d8025d
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/aria-selected_2018-03-02-01-49.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "DetailsList: only adding `aria-selected` when `selectionMode` is set to `none`.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "naethell@microsoft.com"
+}
diff --git a/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.tsx b/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.tsx
index 05e097ffd328a0..a64dafd6a7a6e8 100644
--- a/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.tsx
+++ b/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.tsx
@@ -198,6 +198,7 @@ export class DetailsRow extends BaseComponent<IDetailsRowProps, IDetailsRowState
     const canSelect = selection.canSelectItem!(item);
     const isContentUnselectable = selectionMode === SelectionMode.multiple;
     const showCheckbox = selectionMode !== SelectionMode.none && checkboxVisibility !== CheckboxVisibility.hidden;
+    const ariaSelected = (selectionMode === SelectionMode.none) ? undefined : isSelected;
 
     return (
       <FocusZone
@@ -229,7 +230,7 @@ export class DetailsRow extends BaseComponent<IDetailsRowProps, IDetailsRowState
         draggable={ isDraggable }
         data-automationid='DetailsRow'
         style={ { minWidth: viewport ? viewport.width : 0 } }
-        aria-selected={ isSelected }
+        aria-selected={ ariaSelected }
         allowFocusRoot={ true }
       >
         { showCheckbox && (