diff --git a/src/test/java/dev/osm/mapsplit/SplitTest.java b/src/test/java/dev/osm/mapsplit/SplitTest.java
index 82d3a30..b3fbcf8 100644
--- a/src/test/java/dev/osm/mapsplit/SplitTest.java
+++ b/src/test/java/dev/osm/mapsplit/SplitTest.java
@@ -114,7 +114,7 @@ private void checkMetadata(int min, int max) throws MBTilesReadException {
         try {
             r = new MBTilesReader(new File(MSF_OUTPUT_FILENAME));
             MetadataEntry md = r.getMetadata();
-            Map<String, String> required = new HashMap<>();
+            final Map<String, String> required = new HashMap<>();
             md.getRequiredKeyValuePairs().forEach(new Consumer<Entry<String, String>>() {
 
                 @Override
@@ -123,7 +123,7 @@ public void accept(Entry<String, String> e) {
                 }
 
             });
-            Map<String, String> custom = new HashMap<>();
+            final Map<String, String> custom = new HashMap<>();
             md.getCustomKeyValuePairs().forEach(new Consumer<Entry<String, String>>() {
 
                 @Override