diff --git a/sdk/core/azure-core/inc/azure/core/http/policy.hpp b/sdk/core/azure-core/inc/azure/core/http/policy.hpp
index 004d39c7f..8bff9d1fd 100644
--- a/sdk/core/azure-core/inc/azure/core/http/policy.hpp
+++ b/sdk/core/azure-core/inc/azure/core/http/policy.hpp
@@ -382,7 +382,7 @@ namespace Azure { namespace Core { namespace Http {
   };
 
   namespace _detail {
-    AZ_CORE_DLLEXPORT extern Azure::Core::CaseInsensitiveSet g_defaultAllowedHttpHeaders;
+    AZ_CORE_DLLEXPORT extern Azure::Core::CaseInsensitiveSet const g_defaultAllowedHttpHeaders;
   }
 
   /**
diff --git a/sdk/core/azure-core/src/http/log_policy.cpp b/sdk/core/azure-core/src/http/log_policy.cpp
index bd63bf7cf..8980fe0e5 100644
--- a/sdk/core/azure-core/src/http/log_policy.cpp
+++ b/sdk/core/azure-core/src/http/log_policy.cpp
@@ -97,7 +97,7 @@ inline std::string GetResponseLogMessage(
 }
 } // namespace
 
-Azure::Core::CaseInsensitiveSet Azure::Core::Http::_detail::g_defaultAllowedHttpHeaders
+Azure::Core::CaseInsensitiveSet const Azure::Core::Http::_detail::g_defaultAllowedHttpHeaders
     = {"x-ms-client-request-id",
        "x-ms-return-client-request-id",
        "traceparent",