diff --git a/src/envoy/utils/http_header_utils.cc b/src/envoy/utils/http_header_utils.cc
index b3ab822cd..bf9edb37a 100644
--- a/src/envoy/utils/http_header_utils.cc
+++ b/src/envoy/utils/http_header_utils.cc
@@ -37,14 +37,17 @@ absl::string_view readHeaderEntry(const Envoy::Http::HeaderEntry* entry) {
   return Envoy::EMPTY_STRING;
 }
 
-absl::string_view extractHeader(const Envoy::Http::HeaderMap& headers,
-                                const Envoy::Http::LowerCaseString& header) {
+std::string extractHeader(const Envoy::Http::HeaderMap& headers,
+                          const Envoy::Http::LowerCaseString& header) {
   const auto result =
       Envoy::Http::HeaderUtility::getAllOfHeaderAsString(headers, header);
   if (!result.result().has_value()) {
     return Envoy::EMPTY_STRING;
   }
-  return result.result().value();
+  // When the header has multiple values, result().value() points into the
+  // local result's backing string, so it must be copied out before result
+  // goes out of scope.
+  return std::string(result.result().value());
 }
 
 bool handleHttpMethodOverride(Envoy::Http::RequestHeaderMap& headers) {
diff --git a/src/envoy/utils/http_header_utils.h b/src/envoy/utils/http_header_utils.h
index 4f15dad90..a69e36194 100644
--- a/src/envoy/utils/http_header_utils.h
+++ b/src/envoy/utils/http_header_utils.h
@@ -31,8 +31,8 @@ absl::string_view readHeaderEntry(const Envoy::Http::HeaderEntry* entry);
 // better performance.
 // For details, see
 // https://github.com/envoyproxy/envoy/blob/c5f4302325223765b660f0f366ce25bf8570e7a5/include/envoy/http/header_map.h#L271
-absl::string_view extractHeader(const Envoy::Http::HeaderMap& headers,
-                                const Envoy::Http::LowerCaseString& header);
+std::string extractHeader(const Envoy::Http::HeaderMap& headers,
+                          const Envoy::Http::LowerCaseString& header);
 
 // Get the HTTP method to be used for the request. This method understands the
 // x-http-method-override header. If present, it will override the method