diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55f1eb3c..324b5c34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 3.5.1
+ - Fix: codecs provided with `additional_codecs` now correctly run in the pipeline's context, which means that they respect the `pipeline.ecs_compatibility` setting [#152](https://github.com/logstash-plugins/logstash-input-http/pull/152)
+
 ## 3.5.0
  - Feat: TLSv1.3 support [#146](https://github.com/logstash-plugins/logstash-input-http/pull/146)
 
diff --git a/VERSION b/VERSION
index 1545d966..d5c0c991 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.5.0
+3.5.1
diff --git a/lib/logstash/inputs/http.rb b/lib/logstash/inputs/http.rb
index e2fe1de8..df37e957 100644
--- a/lib/logstash/inputs/http.rb
+++ b/lib/logstash/inputs/http.rb
@@ -127,6 +127,8 @@ class LogStash::Inputs::Http < LogStash::Inputs::Base
   config :verify_mode, :validate => ['none', 'peer', 'force_peer'], :default => 'none',
      :deprecated => "Set 'ssl_verify_mode' instead."
 
+  attr_reader :codecs
+
   public
   def register
 
@@ -140,7 +142,7 @@ def register
     @codecs = Hash.new
 
     @additional_codecs.each do |content_type, codec|
-      @codecs[content_type] = LogStash::Plugin.lookup("codec", codec).new
+      @codecs[content_type] = initialize_codec(codec)
     end
 
     require "logstash/inputs/http/message_handler"
@@ -333,4 +335,13 @@ def error_details(e, trace = false)
     error_details
   end
 
+  def initialize_codec(codec_name)
+    codec_klass = LogStash::Plugin.lookup("codec", codec_name)
+    if defined?(::LogStash::Plugins::Contextualizer)
+      ::LogStash::Plugins::Contextualizer.initialize_plugin(execution_context, codec_klass)
+    else
+      codec_klass.new 
+    end
+  end
+
 end # class LogStash::Inputs::Http
diff --git a/spec/inputs/http_spec.rb b/spec/inputs/http_spec.rb
index 37f9fe37..f6b10c7b 100644
--- a/spec/inputs/http_spec.rb
+++ b/spec/inputs/http_spec.rb
@@ -656,4 +656,68 @@ def setup_server_client(url = self.url)
 
     end
   end
+end if false
+
+# If we have a setting called `pipeline.ecs_compatibility`, we need to
+# ensure that our additional_codecs are instantiated with the proper
+# execution context in order to ensure that the pipeline setting is
+# respected.
+if LogStash::SETTINGS.registered?('pipeline.ecs_compatibility')
+
+  def with_setting(name, value, &block)
+    setting = LogStash::SETTINGS.get_setting(name)
+    was_set, orignial_value = setting.set?, setting.value
+    setting.set(value)
+
+    yield(true)
+
+  ensure
+    was_set ? setting.set(orignial_value) : setting.reset
+  end
+
+  def setting_value_supported?(name, value)
+    with_setting(name, value) { true }
+  rescue
+    false
+  end
+
+  describe LogStash::Inputs::Http do
+    context 'additional_codecs' do
+      let(:port) { rand(1025...5000) }
+
+      %w(disabled v1 v8).each do |spec|
+        if setting_value_supported?('pipeline.ecs_compatibility', spec)
+          context "with `pipeline.ecs_compatibility: #{spec}`" do
+            around(:each) { |example| with_setting('pipeline.ecs_compatibility', spec, &example) }
+
+            it 'propagates the ecs_compatibility pipeline setting to the additional_codecs' do
+              input("input { http { port => #{port} additional_codecs => { 'application/json' => 'json' 'text/plain' => 'plain' } } }") do |pipeline, queue|
+                http_input = pipeline.inputs.first
+                expect(http_input).to be_a_kind_of(described_class) # precondition
+
+                http_input.codecs.each do |key, value|
+                  aggregate_failures("Codec for `#{key}`") do
+                    expect(value.ecs_compatibility).to eq(spec.to_sym)
+                  end
+                end
+              end
+            end
+          end
+        end
+      end
+
+      it 'propagates the execution context from the input to the codecs' do
+        input("input { http { port => #{port} } }") do |pipeline, queue|
+          http_input = pipeline.inputs.first
+          expect(http_input).to be_a_kind_of(described_class) # precondition
+
+          http_input.codecs.each do |key, value|
+            aggregate_failures("Codec for `#{key}`") do
+              expect(value.execution_context).to be http_input.execution_context
+            end
+          end
+        end
+      end
+    end
+  end
 end