diff --git a/lib/async/http/protocol/http2/output.rb b/lib/async/http/protocol/http2/output.rb
index 5320068..ea7019a 100644
--- a/lib/async/http/protocol/http2/output.rb
+++ b/lib/async/http/protocol/http2/output.rb
@@ -135,7 +135,7 @@ def passthrough(task)
 							# chunk.clear unless chunk.frozen?
 							# GC.start
 						end
-					rescue => error
+					rescue Async::Cancel, StandardError => error
 						raise
 					ensure
 						# Ensure the body we are reading from is fully closed:
diff --git a/test/async/http/protocol/http2/output.rb b/test/async/http/protocol/http2/output.rb
new file mode 100644
index 0000000..676affc
--- /dev/null
+++ b/test/async/http/protocol/http2/output.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2026, by Tavian Barnes.
+
+require "async/http/protocol/http2/output"
+require "async/http/body/writable"
+
+require "sus/fixtures/async"
+
+describe Async::HTTP::Protocol::HTTP2::Output do
+	include Sus::Fixtures::Async::ReactorContext
+	
+	let(:stream) do
+		Class.new do
+			def initialize
+				@errors = []
+			end
+			
+			attr :errors
+			
+			def finish_output(error = nil)
+				@errors << error
+			end
+		end.new
+	end
+	
+	let(:body) {Async::HTTP::Body::Writable.new}
+	
+	let(:output) {subject.new(stream, body)}
+	
+	it "propagates cancellation when the task is cancelled" do
+		task = output.start
+		
+		task.cancel
+		task.wait
+		
+		expect(stream.errors.size).to be == 1
+		expect(stream.errors.first).to be_a(Async::Cancel)
+	end
+end