Index: unittests/clangd/XRefsTests.cpp
===================================================================
--- unittests/clangd/XRefsTests.cpp
+++ unittests/clangd/XRefsTests.cpp
@@ -584,7 +584,11 @@
   auto FooH = testPath("foo.h");
   auto FooHUri = URIForFile{FooH};
 
-  const char *HeaderContents = R"cpp([[]]int a;)cpp";
+  const char *HeaderContents = R"cpp([[]]#ifndef TEST_H_
+                                     #define TEST_H_
+                                     int a;
+                                     #endif
+                                     )cpp";
   Annotations HeaderAnnotations(HeaderContents);
   FS.Files[FooH] = HeaderAnnotations.code();