diff --git a/clang-tools-extra/clangd/refactor/Rename.cpp b/clang-tools-extra/clangd/refactor/Rename.cpp
--- a/clang-tools-extra/clangd/refactor/Rename.cpp
+++ b/clang-tools-extra/clangd/refactor/Rename.cpp
@@ -110,7 +110,7 @@
 #include "StdSymbolMap.inc"
 #undef SYMBOL
   });
-  return StdSymbols->count(RenameDecl.getQualifiedNameAsString());
+  return StdSymbols->count(printQualifiedName(RenameDecl));
 }
 
 enum ReasonToReject {
diff --git a/clang-tools-extra/clangd/unittests/RenameTests.cpp b/clang-tools-extra/clangd/unittests/RenameTests.cpp
--- a/clang-tools-extra/clangd/unittests/RenameTests.cpp
+++ b/clang-tools-extra/clangd/unittests/RenameTests.cpp
@@ -593,6 +593,14 @@
          }
        )cpp",
        "not a supported kind", !HeaderFile, Index},
+      {R"cpp(// disallow rename on blacklisted symbols (e.g. std symbols)
+         namespace std {
+         inline namespace __u {
+         class str^ing {};
+         }
+         }
+       )cpp",
+       "not a supported kind", !HeaderFile, Index},
 
       {R"cpp(
          void foo(int);