diff --git a/src/it/test-jar-generate-test-sources/invoker.properties b/src/it/test-jar-generate-test-sources/invoker.properties
new file mode 100644
index 0000000..1dc843a
--- /dev/null
+++ b/src/it/test-jar-generate-test-sources/invoker.properties
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+invoker.goals=${project.groupId}:${project.artifactId}:${project.version}:test-jar
diff --git a/src/it/test-jar-generate-test-sources/pom.xml b/src/it/test-jar-generate-test-sources/pom.xml
new file mode 100644
index 0000000..36b45c9
--- /dev/null
+++ b/src/it/test-jar-generate-test-sources/pom.xml
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.its</groupId>
+  <artifactId>test-jar-generate-test-sources</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>Test for test-jar with generated test sources</name>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <version>@project.version@</version>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>1.3</version>
+        <executions>
+          <execution>
+            <id>generate-test-sources</id>
+            <goals>
+              <goal>run</goal>
+            </goals>
+            <phase>generate-test-sources</phase>
+            <configuration>
+              <tasks>
+                <touch file="target/generated-test-sources/ant/GeneratedTest.java" mkdirs="true" />
+              </tasks>
+              <testSourceRoot>target/generated-test-sources/ant</testSourceRoot>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+
+</project>
diff --git a/src/it/test-jar-generate-test-sources/verify.bsh b/src/it/test-jar-generate-test-sources/verify.bsh
new file mode 100644
index 0000000..45f27bd
--- /dev/null
+++ b/src/it/test-jar-generate-test-sources/verify.bsh
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.*;
+import java.util.*;
+import java.util.jar.*;
+
+try
+{
+    File jarFile = new File( basedir, "target/test-jar-generate-test-sources-1.0-SNAPSHOT-test-sources.jar" );
+    if ( !jarFile.isFile() )
+    {
+        System.out.println( "FAILURE! Test sources JAR does not exist." );
+        return false;
+    }
+
+    JarFile jar = new JarFile( jarFile );
+
+    String[] includedEntries = {
+        "META-INF/MANIFEST.MF",
+        "GeneratedTest.java",
+    };
+    for ( String included : includedEntries )
+    {
+        if ( jar.getEntry( included ) == null )
+        {
+            System.out.println( "FAILURE! Expected entry not found: " + included );
+            return false;
+        }
+    }
+}
+catch( Exception ex )
+{
+    ex.printStackTrace();
+    return false;
+}
+
+return true;
diff --git a/src/main/java/org/apache/maven/plugins/source/TestSourceJarMojo.java b/src/main/java/org/apache/maven/plugins/source/TestSourceJarMojo.java
index dd281dd..1976407 100644
--- a/src/main/java/org/apache/maven/plugins/source/TestSourceJarMojo.java
+++ b/src/main/java/org/apache/maven/plugins/source/TestSourceJarMojo.java
@@ -27,7 +27,7 @@
  * @since 2.0.3
  */
 @Mojo(name = "test-jar", defaultPhase = "package")
-@Execute(phase = "generate-sources")
+@Execute(phase = "generate-test-sources")
 public class TestSourceJarMojo extends TestSourceJarNoForkMojo {
     // no op
 }
diff --git a/src/test/java/org/apache/maven/plugins/source/TestSourceJarMojoTest.java b/src/test/java/org/apache/maven/plugins/source/TestSourceJarMojoTest.java
index e0bc5fe..8ea2f06 100644
--- a/src/test/java/org/apache/maven/plugins/source/TestSourceJarMojoTest.java
+++ b/src/test/java/org/apache/maven/plugins/source/TestSourceJarMojoTest.java
@@ -25,6 +25,7 @@
 import org.apache.maven.api.Project;
 import org.apache.maven.api.ProjectScope;
 import org.apache.maven.api.di.Provides;
+import org.apache.maven.api.plugin.annotations.Execute;
 import org.apache.maven.api.plugin.testing.Basedir;
 import org.apache.maven.api.plugin.testing.InjectMojo;
 import org.apache.maven.api.plugin.testing.MojoParameter;
@@ -35,6 +36,7 @@
 import org.junit.jupiter.api.Test;
 
 import static org.apache.maven.api.plugin.testing.MojoExtension.getBasedir;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
@@ -133,6 +135,12 @@ public void testIncludeMavenDescriptorWhenExplicitlyConfigured(AbstractSourceJar
         });
     }
 
+    @Test
+    void testExecutePhase() {
+        Execute execute = TestSourceJarMojo.class.getAnnotation(Execute.class);
+        assertEquals("generate-test-sources", execute.phase());
+    }
+
     @Provides
     InternalSession createSession() {
         InternalSession session = SessionMock.getMockSession("target/local-repo");