diff --git a/clang-tools-extra/clangd/SemanticHighlighting.cpp b/clang-tools-extra/clangd/SemanticHighlighting.cpp
--- a/clang-tools-extra/clangd/SemanticHighlighting.cpp
+++ b/clang-tools-extra/clangd/SemanticHighlighting.cpp
@@ -31,6 +31,14 @@
   std::vector<HighlightingToken> collectTokens() {
     Tokens.clear();
     TraverseAST(Ctx);
+    // Initializer lists can give duplicates of tokens, therefore all tokens
+    // must be deduplicated.
+    llvm::sort(Tokens,
+               [](const HighlightingToken &Lhs, const HighlightingToken &Rhs) {
+                 return std::tie(Lhs.R, Lhs.Kind) < std::tie(Rhs.R, Rhs.Kind);
+               });
+    auto Last = std::unique(Tokens.begin(), Tokens.end());
+    Tokens.erase(Last, Tokens.end());
     return Tokens;
   }
 
diff --git a/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp b/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
--- a/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
+++ b/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
@@ -166,6 +166,13 @@
         $Variable[[AA]].$Field[[E]].$Field[[C]];
         $Class[[A]]::$Variable[[S]] = 90;
       }
+    )cpp",
+    R"cpp(
+      struct $Class[[AA]] {
+        int $Field[[A]];
+      }
+      int $Variable[[B]];
+      $Class[[AA]] $Variable[[A]]{$Variable[[B]]};
     )cpp"};
   for (const auto &TestCase : TestCases) {
     checkHighlightings(TestCase);