diff --git a/src/it/projects/MSHADE-368/pom.xml b/src/it/projects/MSHADE-368/pom.xml
new file mode 100644
index 00000000..dcc300cc
--- /dev/null
+++ b/src/it/projects/MSHADE-368/pom.xml
@@ -0,0 +1,67 @@
+<?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>
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.its.shade.mshade368</groupId>
+  <artifactId>mshade-368</artifactId>
+  <version>1.0</version>
+
+  <name>MSHADE-368</name>
+  <description>
+    Test shading a Groovy extension module that only declares instance extension classes.
+  </description>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.codehaus.groovy</groupId>
+      <artifactId>groovy-sql</artifactId>
+      <version>3.0.0</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>@project.version@</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <createDependencyReducedPom>false</createDependencyReducedPom>
+              <transformers>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.GroovyResourceTransformer">
+                  <extModuleName>shaded-groovy-sql</extModuleName>
+                  <extModuleVersion>1.0</extModuleVersion>
+                </transformer>
+              </transformers>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/src/it/projects/MSHADE-368/verify.groovy b/src/it/projects/MSHADE-368/verify.groovy
new file mode 100644
index 00000000..db2cb19a
--- /dev/null
+++ b/src/it/projects/MSHADE-368/verify.groovy
@@ -0,0 +1,39 @@
+/*
+ * 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.util.jar.JarFile
+
+def descriptorName = "META-INF/groovy/org.codehaus.groovy.runtime.ExtensionModule"
+def shadedJar = new File(basedir, "target/mshade-368-1.0.jar")
+
+assert shadedJar.isFile()
+
+new JarFile(shadedJar).withCloseable { jar ->
+    def descriptor = jar.getJarEntry(descriptorName)
+    assert descriptor != null
+
+    def properties = new Properties()
+    jar.getInputStream(descriptor).withCloseable { properties.load(it) }
+
+    assert properties.getProperty("moduleName") == "shaded-groovy-sql"
+    assert properties.getProperty("moduleVersion") == "1.0"
+    assert properties.getProperty("extensionClasses") == "org.apache.groovy.sql.extensions.SqlExtensions"
+    assert properties.getProperty("staticExtensionClasses") == null
+    assert jar.getJarEntry("org/apache/groovy/sql/extensions/SqlExtensions.class") != null
+}
diff --git a/src/main/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformer.java b/src/main/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformer.java
index b015574b..305ac0fa 100644
--- a/src/main/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformer.java
+++ b/src/main/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformer.java
@@ -85,7 +85,7 @@ private void append(String entry, List<String> list) {
 
     @Override
     public boolean hasTransformedResource() {
-        return extensionClassesList.size() > 0 && staticExtensionClassesList.size() > 0;
+        return extensionClassesList.size() > 0 || staticExtensionClassesList.size() > 0;
     }
 
     @Override