diff --git a/lib/datadog/core/utils/safe_dup.rb b/lib/datadog/core/utils/safe_dup.rb
index d0c064c76d4..33d20c11998 100644
--- a/lib/datadog/core/utils/safe_dup.rb
+++ b/lib/datadog/core/utils/safe_dup.rb
@@ -24,10 +24,18 @@ def self.frozen_or_dup(v)
             # - then it will dup it more efficiently with +v
             v.frozen? ? v : +(-v)
           end
+
+          def self.frozen_dup(v)
+            -v if v
+          end
         else
           def self.frozen_or_dup(v)
             v.frozen? ? v : v.dup
           end
+
+          def self.frozen_dup(v)
+            v.frozen? ? v : v.dup.freeze
+          end
         end
       end
     end
diff --git a/lib/datadog/tracing/correlation.rb b/lib/datadog/tracing/correlation.rb
index 65dde53bf10..67d5a12ca84 100644
--- a/lib/datadog/tracing/correlation.rb
+++ b/lib/datadog/tracing/correlation.rb
@@ -46,18 +46,18 @@ def initialize(
           version: nil
         )
           # Dup and freeze strings so they aren't modified by reference.
-          @env = Core::Utils::SafeDup.frozen_or_dup(env || Datadog.configuration.env).freeze
-          @service = Core::Utils::SafeDup.frozen_or_dup(service || Datadog.configuration.service).freeze
+          @env = Core::Utils::SafeDup.frozen_dup(env || Datadog.configuration.env)
+          @service = Core::Utils::SafeDup.frozen_dup(service || Datadog.configuration.service)
           @span_id = span_id || 0
-          @span_name = Core::Utils::SafeDup.frozen_or_dup(span_name).freeze
-          @span_resource = Core::Utils::SafeDup.frozen_or_dup(span_resource).freeze
-          @span_service = Core::Utils::SafeDup.frozen_or_dup(span_service).freeze
-          @span_type = Core::Utils::SafeDup.frozen_or_dup(span_type).freeze
+          @span_name = Core::Utils::SafeDup.frozen_dup(span_name)
+          @span_resource = Core::Utils::SafeDup.frozen_dup(span_resource)
+          @span_service = Core::Utils::SafeDup.frozen_dup(span_service)
+          @span_type = Core::Utils::SafeDup.frozen_dup(span_type)
           @trace_id = trace_id || 0
-          @trace_name = Core::Utils::SafeDup.frozen_or_dup(trace_name).freeze
-          @trace_resource = Core::Utils::SafeDup.frozen_or_dup(trace_resource).freeze
-          @trace_service = Core::Utils::SafeDup.frozen_or_dup(trace_service).freeze
-          @version = Core::Utils::SafeDup.frozen_or_dup(version || Datadog.configuration.version).freeze
+          @trace_name = Core::Utils::SafeDup.frozen_dup(trace_name)
+          @trace_resource = Core::Utils::SafeDup.frozen_dup(trace_resource)
+          @trace_service = Core::Utils::SafeDup.frozen_dup(trace_service)
+          @version = Core::Utils::SafeDup.frozen_dup(version || Datadog.configuration.version)
         end
 
         def to_log_format