diff --git a/clang-tools-extra/clangd/index/SymbolCollector.cpp b/clang-tools-extra/clangd/index/SymbolCollector.cpp
index 81125dbb1aeaf..6d0af20e31260 100644
--- a/clang-tools-extra/clangd/index/SymbolCollector.cpp
+++ b/clang-tools-extra/clangd/index/SymbolCollector.cpp
@@ -550,9 +550,14 @@ bool SymbolCollector::shouldCollectSymbol(const NamedDecl &ND,
   // Avoid indexing internal symbols in protobuf generated headers.
   if (isPrivateProtoDecl(ND))
     return false;
+
+  // System headers that end with `intrin.h` likely contain useful symbols.
   if (!Opts.CollectReserved &&
       (hasReservedName(ND) || hasReservedScope(*ND.getDeclContext())) &&
-      ASTCtx.getSourceManager().isInSystemHeader(ND.getLocation()))
+      ASTCtx.getSourceManager().isInSystemHeader(ND.getLocation()) &&
+      !ASTCtx.getSourceManager()
+           .getFilename(ND.getLocation())
+           .ends_with("intrin.h"))
     return false;
 
   return true;
diff --git a/clang-tools-extra/clangd/unittests/SymbolCollectorTests.cpp b/clang-tools-extra/clangd/unittests/SymbolCollectorTests.cpp
index e8088cb37fa51..7a9703c744e93 100644
--- a/clang-tools-extra/clangd/unittests/SymbolCollectorTests.cpp
+++ b/clang-tools-extra/clangd/unittests/SymbolCollectorTests.cpp
@@ -2111,6 +2111,20 @@ TEST_F(SymbolCollectorTest, Reserved) {
   EXPECT_THAT(Symbols, IsEmpty());
 }
 
+TEST_F(SymbolCollectorTest, ReservedSymbolInIntrinsicHeader) {
+  const char *Header = R"cpp(
+    #pragma once
+    void __foo();
+  )cpp";
+
+  TestHeaderName = "xintrin.h";
+  TestHeaderURI = URI::create(testPath(TestHeaderName)).toString();
+  InMemoryFileSystem = new llvm::vfs::InMemoryFileSystem;
+  CollectorOpts.FallbackDir = testRoot();
+  runSymbolCollector("#pragma GCC system_header\n" + std::string(Header), "");
+  EXPECT_THAT(Symbols, UnorderedElementsAre(qName("__foo")));
+}
+
 TEST_F(SymbolCollectorTest, Concepts) {
   const char *Header = R"cpp(
     template <class T>