diff --git a/clang-tools-extra/clangd/ClangdUnit.cpp b/clang-tools-extra/clangd/ClangdUnit.cpp
--- a/clang-tools-extra/clangd/ClangdUnit.cpp
+++ b/clang-tools-extra/clangd/ClangdUnit.cpp
@@ -61,6 +61,7 @@
 }
 
 class DeclTrackingASTConsumer : public ASTConsumer {
+  SourceManager *SM;
 public:
   DeclTrackingASTConsumer(std::vector<Decl *> &TopLevelDecls)
       : TopLevelDecls(TopLevelDecls) {}
@@ -70,6 +71,11 @@
       if (D->isFromASTFile())
         continue;
 
+      if (!SM->isInMainFile(D->getLocation()))
+        // This decl comes from another file and should not be included in the
+        // top level decls.
+        continue;
+
       // ObjCMethodDecl are not actually top-level decls.
       if (isa<ObjCMethodDecl>(D))
         continue;
@@ -79,6 +85,10 @@
     return true;
   }
 
+  virtual void Initialize(ASTContext &Context) override {
+    SM = &Context.getSourceManager();
+  }
+
 private:
   std::vector<Decl *> &TopLevelDecls;
 };
diff --git a/clang-tools-extra/clangd/unittests/ClangdUnitTests.cpp b/clang-tools-extra/clangd/unittests/ClangdUnitTests.cpp
--- a/clang-tools-extra/clangd/unittests/ClangdUnitTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ClangdUnitTests.cpp
@@ -83,6 +83,23 @@
   EXPECT_THAT(AST.getLocalTopLevelDecls(), ElementsAre(DeclNamed("main")));
 }
 
+TEST(ClangdUnitTest, DoesNotGetIncludedTopDecls) {
+  TestTU TU;
+  TU.HeaderCode = R"cpp(
+    template<class T>
+    struct H {
+      H() {}
+    };
+  )cpp";
+  TU.Code = R"cpp(
+    int main() {
+      H<int> h;
+    }
+  )cpp";
+  auto AST = TU.build();
+  EXPECT_THAT(AST.getLocalTopLevelDecls(), ElementsAre(DeclNamed("main")));
+}
+
 TEST(ClangdUnitTest, TokensAfterPreamble) {
   TestTU TU;
   TU.AdditionalFiles["foo.h"] = R"(