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
@@ -231,6 +231,12 @@
       // FIXME: skip tokens inside macros for now.
       return;
 
+    // Non top level decls that are included from a header are not filtered by
+    // topLevelDecls. (example: method declarations being included from another
+    // file for a class) from another file)
+    if (!SM.isWrittenInMainFile(Loc))
+      return;
+
     auto R = getTokenRange(SM, Ctx.getLangOpts(), Loc);
     if (!R) {
       // R should always have a value, if it doesn't something is very wrong.
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
@@ -51,9 +51,16 @@
   return ExpectedTokens;
 }
 
-void checkHighlightings(llvm::StringRef Code) {
+// AdditionalFiles are key-value-pair that are included in the TU where the key
+// is the filename and the value is the code for the file.
+void checkHighlightings(llvm::StringRef Code,
+                        std::vector<std::pair<llvm::StringRef, llvm::StringRef>>
+                            AdditionalFiles = {}) {
   Annotations Test(Code);
-  auto AST = TestTU::withCode(Test.code()).build();
+  auto TU = TestTU::withCode(Test.code());
+  for (auto File : AdditionalFiles)
+    TU.AdditionalFiles.insert({File.first, File.second});
+  auto AST = TU.build();
   std::vector<HighlightingToken> ActualTokens = getSemanticHighlightings(AST);
   EXPECT_THAT(ActualTokens, getExpectedTokens(Test)) << Code;
 }
@@ -321,6 +328,17 @@
   for (const auto &TestCase : TestCases) {
     checkHighlightings(TestCase);
   }
+
+  checkHighlightings(R"cpp(
+    class $Class[[A]] {
+      #include "imp.h"
+    };
+    #endif
+  )cpp",
+                     {{"imp.h", R"cpp(
+    int someMethod();
+    void otherMethod();
+  )cpp"}});
 }
 
 TEST(SemanticHighlighting, GeneratesHighlightsWhenFileChange) {