diff --git a/integration/feature/inspect/src/InspectTests.scala b/integration/feature/inspect/src/InspectTests.scala
index 7b63e877c48a..82ea1c0454ec 100644
--- a/integration/feature/inspect/src/InspectTests.scala
+++ b/integration/feature/inspect/src/InspectTests.scala
@@ -146,7 +146,6 @@ object InspectTests extends UtestIntegrationTestSuite {
           |    mill.javalib.bsp.BspModule
           |    mill.javalib.RunModule
           |    mill.javalib.GenIdeaModule
-          |    mill.javalib.OfflineSupportModule
           |    mill.javalib.SemanticDbJavaModule
           |    mill.javalib.AssemblyModule
           |    mill.javalib.JavaModule
@@ -171,7 +170,6 @@ object InspectTests extends UtestIntegrationTestSuite {
           |    mill.javalib.bsp.BspModule
           |    mill.javalib.RunModule
           |    mill.javalib.GenIdeaModule
-          |    mill.javalib.OfflineSupportModule
           |    mill.javalib.SemanticDbJavaModule
           |    mill.javalib.AssemblyModule
           |    mill.javalib.JavaModule
diff --git a/libs/javalib/src/mill/javalib/AssemblyModule.scala b/libs/javalib/src/mill/javalib/AssemblyModule.scala
index a3ef4a185f4d..6573ab4b305f 100644
--- a/libs/javalib/src/mill/javalib/AssemblyModule.scala
+++ b/libs/javalib/src/mill/javalib/AssemblyModule.scala
@@ -11,7 +11,7 @@ import mill.util.Jvm
 /**
  * Module that provides functionality around creating and configuring JVM assembly jars
  */
-trait AssemblyModule extends mill.api.Module {
+trait AssemblyModule extends mill.api.Module with OfflineSupportModule {
   outer =>
 
   def finalMainClassOpt: T[Either[String, String]]
@@ -148,6 +148,11 @@ trait AssemblyModule extends mill.api.Module {
       created.pathRef
     }
   }
+
+  override def prepareOffline(all: mainargs.Flag): Task.Command[Seq[PathRef]] = Task.Command {
+    AssemblyModule.prepareOffline(all)()
+  }
+
 }
 object AssemblyModule extends ExternalModule with CoursierModule with OfflineSupportModule {