diff --git a/graphenej/src/main/java/cy/agorise/graphenej/api/calls/GetBlock.java b/graphenej/src/main/java/cy/agorise/graphenej/api/calls/GetBlock.java
index 6a54e6c..beb6c05 100644
--- a/graphenej/src/main/java/cy/agorise/graphenej/api/calls/GetBlock.java
+++ b/graphenej/src/main/java/cy/agorise/graphenej/api/calls/GetBlock.java
@@ -17,7 +17,7 @@ public class GetBlock implements ApiCallable {
 
     private long blockNumber;
 
-    public GetBlock(int blockNum){
+    public GetBlock(long blockNum){
         this.blockNumber = blockNum;
     }