diff --git a/common/changes/office-ui-fabric-react/flexshrink-fix_2018-04-19-20-18.json b/common/changes/office-ui-fabric-react/flexshrink-fix_2018-04-19-20-18.json
new file mode 100644
index 00000000000000..10306dc5b7e845
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/flexshrink-fix_2018-04-19-20-18.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "DetailsRow: applying `flex-shrink:0` to the check cell to prevent it from squishing in the flex layout.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "dzearing@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.scss b/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.scss
index 262aa48d3da731..92f1c6a7249494 100644
--- a/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.scss
+++ b/packages/office-ui-fabric-react/src/components/DetailsList/DetailsRow.scss
@@ -228,6 +228,7 @@ $detailsList-item-focus-meta-text-color: $ms-color-neutralDark;
     // cause other items to be deselected.
     padding-top: 1px;
     margin-top: -1px;
+    flex-shrink: 0;
   }
 
   & > button {