1 files changed, 3 insertions, 1 deletions
diff --git a/clangd/index/Index.h b/clangd/index/Index.h
index f0414bf7..1816d79f 100644
--- a/clangd/index/Index.h
+++ b/clangd/index/Index.h
@@ -52,7 +52,9 @@ public:
 
 private:
   friend llvm::hash_code hash_value(const SymbolID &ID) {
-    return hash_value(ArrayRef<uint8_t>(ID.HashValue));
+    // We already have a good hash, just return the first bytes.
+    static_assert(sizeof(size_t) <= 20, "size_t longer than SHA1!");
+    return *reinterpret_cast<const size_t *>(ID.HashValue.data());
   }
   friend llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
                                        const SymbolID &ID);