diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index a46c9b6..f3da506 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -343,6 +343,7 @@
 TEST_F(FormatTest, FormatsVariableDeclarationsAfterStructOrClass) {
   verifyFormat("class A {} a, b;");
   verifyFormat("struct A {} a, b;");
+  verifyFormat("union A {} a;");
 }
 
 TEST_F(FormatTest, FormatsEnum) {