diff --git a/clang-tools-extra/clangd/ConfigCompile.cpp b/clang-tools-extra/clangd/ConfigCompile.cpp
--- a/clang-tools-extra/clangd/ConfigCompile.cpp
+++ b/clang-tools-extra/clangd/ConfigCompile.cpp
@@ -371,7 +371,7 @@
   }
 
   void compile(Fragment::DiagnosticsBlock &&F) {
-    std::vector<llvm::StringRef> Normalized;
+    std::vector<std::string> Normalized;
     for (const auto &Suppressed : F.Suppress) {
       if (*Suppressed == "*") {
         Out.Apply.push_back([&](const Params &, Config &C) {
@@ -380,7 +380,7 @@
         });
         return;
       }
-      Normalized.push_back(normalizeSuppressedCode(*Suppressed));
+      Normalized.push_back(normalizeSuppressedCode(*Suppressed).str());
     }
     if (!Normalized.empty())
       Out.Apply.push_back([Normalized](const Params &, Config &C) {