diff --git a/src/main/java/net/minestom/server/network/packet/server/play/MultiBlockChangePacket.java b/src/main/java/net/minestom/server/network/packet/server/play/MultiBlockChangePacket.java
index 8373dae03..c50f39d19 100644
--- a/src/main/java/net/minestom/server/network/packet/server/play/MultiBlockChangePacket.java
+++ b/src/main/java/net/minestom/server/network/packet/server/play/MultiBlockChangePacket.java
@@ -24,7 +24,7 @@ public record MultiBlockChangePacket(long chunkSectionPosition,
     public void write(@NotNull BinaryWriter writer) {
         writer.writeLong(chunkSectionPosition);
         writer.writeBoolean(suppressLightUpdates);
-        writer.writeLongArray(blocks);
+        writer.writeVarLongArray(blocks);
     }
 
     @Override
diff --git a/src/main/java/net/minestom/server/utils/binary/BinaryWriter.java b/src/main/java/net/minestom/server/utils/binary/BinaryWriter.java
index 4462370a5..2642b3cad 100644
--- a/src/main/java/net/minestom/server/utils/binary/BinaryWriter.java
+++ b/src/main/java/net/minestom/server/utils/binary/BinaryWriter.java
@@ -221,6 +221,17 @@ public class BinaryWriter extends OutputStream {
         }
     }
 
+    public void writeVarLongArray(long[] array) {
+        if (array == null) {
+            writeVarInt(0);
+            return;
+        }
+        writeVarInt(array.length);
+        for (long element : array) {
+            writeVarLong(element);
+        }
+    }
+
     public void writeLongArray(long[] array) {
         if (array == null) {
             writeVarInt(0);