diff --git a/common/changes/@uifabric/utilities/keco-fix-merge-aria-attrs_2019-02-21-18-39.json b/common/changes/@uifabric/utilities/keco-fix-merge-aria-attrs_2019-02-21-18-39.json
new file mode 100644
index 00000000000000..2ed67ee46a4eb5
--- /dev/null
+++ b/common/changes/@uifabric/utilities/keco-fix-merge-aria-attrs_2019-02-21-18-39.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@uifabric/utilities",
+      "comment": "Modify mergeAriaAttributeValues to return space delimited string of values",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@uifabric/utilities",
+  "email": "keco@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/utilities/src/aria.ts b/packages/utilities/src/aria.ts
index 2dc852d098fe6e..38328b770870b7 100644
--- a/packages/utilities/src/aria.ts
+++ b/packages/utilities/src/aria.ts
@@ -2,11 +2,9 @@
  * ARIA helper to concatenate attributes, returning undefined if all attributes
  * are undefined. (Empty strings are not a valid ARIA attribute value.)
  *
- * NOTE: This function will NOT insert whitespace between provided attributes.
- *
  * @param ariaAttributes - ARIA attributes to merge
  */
 export function mergeAriaAttributeValues(...ariaAttributes: (string | undefined)[]): string | undefined {
-  const mergedAttribute = ariaAttributes.filter((arg: string | undefined) => arg !== undefined && arg !== null).join('');
+  const mergedAttribute = ariaAttributes.filter((arg: string | undefined) => arg !== undefined && arg !== null).join(' ');
   return mergedAttribute === '' ? undefined : mergedAttribute;
 }