diff --git a/java/org/slub/rosetta/dps/repository/plugin/Validation/TestSLUBValidateRelaxNG.java b/java/org/slub/rosetta/dps/repository/plugin/Validation/TestSLUBValidateRelaxNG.java
index 22ea68fcdeed420a396cc94def3060152ea18f4c..783cef6c9b9cde2da624241ce8fba6ee69e266f7 100644
--- a/java/org/slub/rosetta/dps/repository/plugin/Validation/TestSLUBValidateRelaxNG.java
+++ b/java/org/slub/rosetta/dps/repository/plugin/Validation/TestSLUBValidateRelaxNG.java
@@ -4,6 +4,7 @@ import org.junit.Before;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 import org.slub.rosetta.dps.repository.plugin.SLUBXmlFormatValidationPlugin;
+import org.w3c.dom.Document;
 
 import java.io.File;
 import java.net.URI;
@@ -52,7 +53,7 @@ public class TestSLUBValidateRelaxNG {
         var has_exception = false;
         var res = false;
         try {
-            var doc = mock.getDocument("resources/test/valid/my_relaxng_test.valid.xml");
+            Document doc = mock.getDocument("resources/test/valid/my_relaxng_test.valid.xml");
             res = v.validateAgainst(doc, local2Uri("example_catalog/my_relaxng_test.rng"));
         } catch ( Exception e) {
             e.printStackTrace();
@@ -68,7 +69,7 @@ public class TestSLUBValidateRelaxNG {
         var has_exception = false;
         var res = false;
         try {
-            var doc = mock.getDocument("resources/test/invalid/my_relaxng_test.invalid.xml");
+            Document doc = mock.getDocument("resources/test/invalid/my_relaxng_test.invalid.xml");
             res = v.validateAgainst(doc, new URI("example_catalog/my_relaxng_test.rng"));
         } catch ( Exception e) {
             System.out.println( "EXCEPTION:" + e.getMessage());