diff --git a/src/main/jni-java-src/it/tdlight/tdnative/NativeClient.java b/src/main/jni-java-src/it/tdlight/tdnative/NativeClient.java
index b4e04da..5342dd1 100644
--- a/src/main/jni-java-src/it/tdlight/tdnative/NativeClient.java
+++ b/src/main/jni-java-src/it/tdlight/tdnative/NativeClient.java
@@ -4,11 +4,16 @@ import it.tdlight.jni.TdApi;
 
 public class NativeClient {
 
-    protected static native int createNativeClient();
+	protected static native int createNativeClient();
 
-    protected static native void nativeClientSend(int nativeClientId, long eventId, TdApi.Function function);
+	protected static native <R extends TdApi.Object> void nativeClientSend(int nativeClientId,
+			long eventId,
+			TdApi.Function<R> function);
 
-    protected static native int nativeClientReceive(int[] clientIds, long[] eventIds, TdApi.Object[] events, double timeout);
+	protected static native int nativeClientReceive(int[] clientIds,
+			long[] eventIds,
+			TdApi.Object[] events,
+			double timeout);
 
-    protected static native TdApi.Object nativeClientExecute(TdApi.Function function);
+	protected static native <R extends TdApi.Object> TdApi.Object nativeClientExecute(TdApi.Function<R> function);
 }