diff --git a/src/ffi/java/buffer.rs b/src/ffi/java/buffer.rs
index f85c621..0f7b59b 100644
--- a/src/ffi/java/buffer.rs
+++ b/src/ffi/java/buffer.rs
@@ -98,12 +98,12 @@ pub extern "system" fn Java_mp_code_BufferController_send<'local>(
 		.jexcept(&mut env);
 
 	let controller = unsafe { Box::leak(Box::from_raw(self_ptr as *mut crate::buffer::Controller)) };
-	controller.send(crate::api::TextChange {
+	RT.block_on(controller.send(crate::api::TextChange {
 		start: start as u32,
 		end: end as u32,
 		content,
 		hash: None
-	}).jexcept(&mut env);
+	})).jexcept(&mut env);
 }
 
 /// Called by the Java GC to drop a [crate::buffer::Controller].
diff --git a/src/ffi/java/cursor.rs b/src/ffi/java/cursor.rs
index 17baec8..7a43807 100644
--- a/src/ffi/java/cursor.rs
+++ b/src/ffi/java/cursor.rs
@@ -99,12 +99,12 @@ pub extern "system" fn Java_mp_code_CursorController_send<'local>(
 	};
 
 	let controller = unsafe { Box::leak(Box::from_raw(self_ptr as *mut crate::cursor::Controller)) };
-	controller.send(crate::api::Cursor {
+	RT.block_on(controller.send(crate::api::Cursor {
 		start: (start_row, start_col),
 		end: (end_row, end_col),
 		buffer,
 		user
-	}).jexcept(&mut env);
+	})).jexcept(&mut env);
 }
 
 /// Called by the Java GC to drop a [crate::cursor::Controller].