diff --git a/dotnet/Cucumber.HtmlFormatter/MessagesToHtmlWriter.cs b/dotnet/Cucumber.HtmlFormatter/MessagesToHtmlWriter.cs
index bb3a8e3f..1cd26ecd 100644
--- a/dotnet/Cucumber.HtmlFormatter/MessagesToHtmlWriter.cs
+++ b/dotnet/Cucumber.HtmlFormatter/MessagesToHtmlWriter.cs
@@ -112,6 +112,10 @@ public void Write(Envelope envelope)
             _preMessageWritten = true;
             _writer.Flush();
         }
+        if(envelope.StepDefinition != null || envelope.Hook != null || envelope.ParameterType != null)
+        {
+            return;
+        }
         if (!_firstMessageWritten)
         {
             _firstMessageWritten = true;
@@ -142,6 +146,10 @@ public async Task WriteAsync(Envelope envelope)
             _preMessageWritten = true;
             await _writer.FlushAsync();
         }
+        if(envelope.Source != null || envelope.StepDefinition != null)
+        {
+            return;
+        }
         if (!_firstMessageWritten)
         {
             _firstMessageWritten = true;
diff --git a/java/src/main/java/io/cucumber/htmlformatter/MessagesToHtmlWriter.java b/java/src/main/java/io/cucumber/htmlformatter/MessagesToHtmlWriter.java
index c410b682..e97b0cee 100644
--- a/java/src/main/java/io/cucumber/htmlformatter/MessagesToHtmlWriter.java
+++ b/java/src/main/java/io/cucumber/htmlformatter/MessagesToHtmlWriter.java
@@ -143,6 +143,12 @@ public void write(Envelope envelope) throws IOException {
             preMessageWritten = true;
         }
 
+        if (envelope.getStepDefinition().isPresent() 
+                || envelope.getHook().isPresent()
+                || envelope.getParameterType().isPresent()) {
+            return;
+        }
+
         if (!firstMessageWritten) {
             firstMessageWritten = true;
         } else {
diff --git a/java/src/test/java/io/cucumber/htmlformatter/MessagesToHtmlWriterTest.java b/java/src/test/java/io/cucumber/htmlformatter/MessagesToHtmlWriterTest.java
index fa69816c..e0f0044f 100644
--- a/java/src/test/java/io/cucumber/htmlformatter/MessagesToHtmlWriterTest.java
+++ b/java/src/test/java/io/cucumber/htmlformatter/MessagesToHtmlWriterTest.java
@@ -6,6 +6,12 @@
 import io.cucumber.messages.types.Envelope;
 import io.cucumber.messages.types.GherkinDocument;
 import io.cucumber.messages.types.Location;
+import io.cucumber.messages.types.Source;
+import io.cucumber.messages.types.SourceMediaType;
+import io.cucumber.messages.types.SourceReference;
+import io.cucumber.messages.types.StepDefinition;
+import io.cucumber.messages.types.StepDefinitionPattern;
+import io.cucumber.messages.types.StepDefinitionPatternType;
 import io.cucumber.messages.types.TestRunFinished;
 import io.cucumber.messages.types.TestRunStarted;
 import org.junit.jupiter.api.Test;
@@ -15,6 +21,7 @@
 import java.io.IOException;
 import java.time.Instant;
 
+import static io.cucumber.messages.types.SourceMediaType.TEXT_X_CUCUMBER_GHERKIN_PLAIN;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.Collections.singletonList;
 import static org.hamcrest.CoreMatchers.containsString;
@@ -61,6 +68,14 @@ void it_writes_no_message_to_html() throws IOException {
         assertThat(html, containsString("window.CUCUMBER_MESSAGES = [];"));
     }
 
+    @Test
+    void it_ignores_step_definition_messages() throws IOException {
+        StepDefinitionPattern pattern = new StepDefinitionPattern("hello {int} cucumber(s)", StepDefinitionPatternType.CUCUMBER_EXPRESSION);
+        Envelope envelope = Envelope.of(new StepDefinition("123", pattern, SourceReference.of("path/to/StepDefinition.java")));
+        String html = renderAsHtml(envelope);
+        assertThat(html, containsString("window.CUCUMBER_MESSAGES = [];"));
+    }
+
     @Test
     void it_writes_default_title() throws IOException {
         String html = renderAsHtml(MessagesToHtmlWriter.builder(serializer));
diff --git a/javascript/src/CucumberHtmlStream.ts b/javascript/src/CucumberHtmlStream.ts
index 8738fb4d..63d4cca9 100644
--- a/javascript/src/CucumberHtmlStream.ts
+++ b/javascript/src/CucumberHtmlStream.ts
@@ -138,6 +138,10 @@ export class CucumberHtmlStream extends Transform {
   }
 
   private writeMessage(envelope: messages.Envelope) {
+    if (envelope.stepDefinition || envelope.hook || envelope.parameterType) {
+      return;
+    }
+    
     if (!this.firstMessageWritten) {
       this.firstMessageWritten = true
     } else {
diff --git a/ruby/lib/cucumber/html_formatter/formatter.rb b/ruby/lib/cucumber/html_formatter/formatter.rb
index 3d7243aa..263ca1be 100644
--- a/ruby/lib/cucumber/html_formatter/formatter.rb
+++ b/ruby/lib/cucumber/html_formatter/formatter.rb
@@ -22,6 +22,10 @@ def process_messages(messages)
       end
 
       def write_message(message)
+        if message.step_definition != nil || message.hook != nil  || message.parameter_type != nil
+          return
+        end
+                
         out.puts(',') unless @first_message
         # Replace < with \x3C
         # https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements