diff --git a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
index 394760ef..4ad9e108 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
@@ -18,4 +18,6 @@ public interface DocumentProcessor {
     Bitmap getPageAtIndex(int index);
     int getPageCount();
 
+    void close();
+
 }
diff --git a/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java b/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
index 36bbdcef..516e2207 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
@@ -77,4 +77,9 @@ public class DocumentProcessorImpl implements DocumentProcessor{
     public int getPageCount() {
         return 0;
     }
+
+    @Override
+    public void close() {
+
+    }
 }