diff --git a/src/com/inet/gradle/setup/msi/Msi.java b/src/com/inet/gradle/setup/msi/Msi.java
index ac113e85..f4bb4115 100644
--- a/src/com/inet/gradle/setup/msi/Msi.java
+++ b/src/com/inet/gradle/setup/msi/Msi.java
@@ -32,6 +32,7 @@
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.InputFile;
 import org.gradle.api.tasks.InputFiles;
+import org.gradle.api.tasks.Internal;
 import org.gradle.util.ConfigureUtil;
 
 import com.inet.gradle.setup.abstracts.AbstractSetupTask;
@@ -636,6 +637,7 @@ public void setExternalSignTool( Closure<?> externalSignTool ) {
      *
      * @return closure the data for signing
      */
+    @Internal
     public Closure<?> getExternalSignTool() {
         return externalSignTool;
     }