diff --git a/lib/datadog/tracing/metadata/metastruct.rb b/lib/datadog/tracing/metadata/metastruct.rb
index 840dcec3c2e..45695430905 100644
--- a/lib/datadog/tracing/metadata/metastruct.rb
+++ b/lib/datadog/tracing/metadata/metastruct.rb
@@ -28,6 +28,10 @@ def get_metastruct_field(key)
           metastruct[key]
         end
 
+        def set_metastruct_field(key, value)
+          metastruct[key] = value
+        end
+
         protected
 
         def metastruct
diff --git a/sig/datadog/tracing/metadata/metastruct.rbs b/sig/datadog/tracing/metadata/metastruct.rbs
index 668f8409628..4dbd7c32aeb 100644
--- a/sig/datadog/tracing/metadata/metastruct.rbs
+++ b/sig/datadog/tracing/metadata/metastruct.rbs
@@ -10,6 +10,8 @@ module Datadog
 
         def get_metastruct_field: (String key) -> untyped
 
+        def set_metastruct_field: (String key, untyped value) -> void
+
         def metastruct: () -> metastruct
       end
     end