diff --git a/library/common/extensions/filters/http/platform_bridge/c_types.cc b/library/common/extensions/filters/http/platform_bridge/c_types.cc
index e437f7b147..b06216bce1 100644
--- a/library/common/extensions/filters/http/platform_bridge/c_types.cc
+++ b/library/common/extensions/filters/http/platform_bridge/c_types.cc
@@ -3,6 +3,10 @@
 
 #include "envoy/http/filter.h"
 
+const envoy_data envoy_unaltered_data = {0};
+
+const envoy_headers envoy_unaltered_headers = {0};
+
 const envoy_filter_headers_status_t kEnvoyFilterHeadersStatusContinue =
     static_cast<envoy_filter_headers_status_t>(Envoy::Http::FilterHeadersStatus::Continue);
 const envoy_filter_headers_status_t kEnvoyFilterHeadersStatusStopIteration =
diff --git a/library/common/extensions/filters/http/platform_bridge/c_types.h b/library/common/extensions/filters/http/platform_bridge/c_types.h
index a381117c64..734db99d6a 100644
--- a/library/common/extensions/filters/http/platform_bridge/c_types.h
+++ b/library/common/extensions/filters/http/platform_bridge/c_types.h
@@ -4,6 +4,16 @@
 
 // NOLINT(namespace-envoy)
 
+/**
+ * Convenience constant indicating no changes to data.
+ */
+extern const envoy_data envoy_unaltered_data;
+
+/**
+ * Convenience constant indicating no changes to headers.
+ */
+extern const envoy_headers envoy_unaltered_headers;
+
 /**
  * Return codes for on-headers filter invocations. @see envoy/http/filter.h
  */
@@ -37,7 +47,7 @@ extern const envoy_filter_data_status_t kEnvoyFilterDataStatusResumeIteration;
 typedef struct {
   envoy_filter_data_status_t status;
   envoy_data data;
-  envoy_headers extra_headers;
+  envoy_headers* extra_headers;
 } envoy_filter_data_status;
 
 /**
@@ -54,8 +64,8 @@ extern const envoy_filter_trailers_status_t kEnvoyFilterTrailersStatusResumeIter
 typedef struct {
   envoy_filter_trailers_status_t status;
   envoy_headers trailers;
-  envoy_headers extra_headers;
-  envoy_data extra_data;
+  envoy_headers* extra_headers;
+  envoy_data* extra_data;
 } envoy_filter_trailers_status;
 
 #ifdef __cplusplus