diff --git a/src/main/groovy/com/github/jengelman/gradle/plugins/shadow/ShadowExtension.groovy b/src/main/groovy/com/github/jengelman/gradle/plugins/shadow/ShadowExtension.groovy
index 865b3a3e1..03a575d54 100644
--- a/src/main/groovy/com/github/jengelman/gradle/plugins/shadow/ShadowExtension.groovy
+++ b/src/main/groovy/com/github/jengelman/gradle/plugins/shadow/ShadowExtension.groovy
@@ -5,16 +5,20 @@ import org.gradle.api.Project
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.artifacts.SelfResolvingDependency
 import org.gradle.api.file.RegularFile
+import org.gradle.api.provider.Property
 import org.gradle.api.provider.Provider
 import org.gradle.api.publish.maven.MavenPom
 import org.gradle.api.publish.maven.MavenPublication
 
 class ShadowExtension {
-    private final Provider<Provider<RegularFile>> archiveFile
+    private final Provider<Archive> archive
     private final Provider<List<Dep>> allDependencies
 
     ShadowExtension(Project project) {
-        archiveFile = project.provider { project.tasks.withType(ShadowJar).getByName("shadowJar").archiveFile }
+        archive = project.provider {
+            def archiveTask = project.tasks.withType(ShadowJar).getByName("shadowJar")
+            new Archive(archiveTask.archiveFile, archiveTask.archiveClassifier)
+        }
         allDependencies = project.provider {
             project.configurations.getByName("shadow").allDependencies.collect {
                 if ((it instanceof ProjectDependency) || !(it instanceof SelfResolvingDependency)) {
@@ -25,7 +29,10 @@ class ShadowExtension {
     }
 
     void component(MavenPublication publication) {
-        publication.artifact(archiveFile.get())
+        publication.artifact([
+                source    : archive.get().file,
+                classifier: archive.get().classifier.get()
+        ])
 
         // Don't inline this variable, it seems Groovy closure capturing is confused by the field instead of a local variable.
         final def allDeps = allDependencies
@@ -43,6 +50,16 @@ class ShadowExtension {
         }
     }
 
+    private class Archive {
+        Provider<RegularFile> file
+        Property<String> classifier
+
+        Archive(Provider<RegularFile> file, Property<String> classifier) {
+            this.file = file
+            this.classifier = classifier
+        }
+    }
+
     private class Dep {
         String group
         String name
diff --git a/src/test/groovy/com/github/jengelman/gradle/plugins/shadow/PublishingSpec.groovy b/src/test/groovy/com/github/jengelman/gradle/plugins/shadow/PublishingSpec.groovy
index 3fb11411d..5ad14b19d 100644
--- a/src/test/groovy/com/github/jengelman/gradle/plugins/shadow/PublishingSpec.groovy
+++ b/src/test/groovy/com/github/jengelman/gradle/plugins/shadow/PublishingSpec.groovy
@@ -78,6 +78,54 @@ class PublishingSpec extends PluginSpecification {
         assert dependency.version.text() == '1.0'
     }
 
+    def "publish shadow jar with maven-publish plugin using custom classifier and extension"() {
+        given:
+        repo.module('shadow', 'a', '1.0')
+                .insertFile('a.properties', 'a')
+                .insertFile('a2.properties', 'a2')
+                .publish()
+        repo.module('shadow', 'b', '1.0')
+                .insertFile('b.properties', 'b')
+                .publish()
+
+        settingsFile << "rootProject.name = 'maven'"
+        buildFile << """
+            apply plugin: 'maven-publish'
+
+            dependencies {
+               implementation 'shadow:a:1.0'
+               shadow 'shadow:b:1.0'
+            }
+            
+            shadowJar {
+               archiveClassifier = 'my-classifier'
+               archiveExtension = 'my-ext'
+               archiveBaseName = 'maven-all'
+            }
+            
+            publishing {
+               publications {
+                   shadow(MavenPublication) { publication ->
+                       project.shadow.component(publication)
+                       artifactId = 'maven-all'
+                   }
+               }
+               repositories {
+                   maven {
+                       url "${publishingRepo.uri}"
+                   }
+               }
+            }
+        """.stripIndent()
+
+        when:
+        run('publish')
+
+        then:
+        File publishedFile = publishingRepo.rootDir.file('shadow/maven-all/1.0/maven-all-1.0-my-classifier.my-ext').canonicalFile
+        assert publishedFile.exists()
+    }
+
     def "publish multiproject shadow jar with maven-publish plugin"() {
         given: