diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 8eadb54..c17bc0d 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -768,6 +768,8 @@
   verifyFormat("a * ++b;");
   verifyFormat("a * --b;");
 
+  verifyFormat("InvalidRegions[*R] = 0;");
+
   // FIXME: Is this desired for LLVM? Fix if not.
   verifyFormat("A<int *> a;");
   verifyFormat("A<int **> a;");