diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h
index 21fac550f4121fdc..268d2d37ccac8b71 100644
--- a/include/libcamera/camera.h
+++ b/include/libcamera/camera.h
@@ -79,7 +79,7 @@ public:
 	const std::string &name() const;
 
 	Signal<Request *, Buffer *> bufferCompleted;
-	Signal<Request *, const std::map<Stream *, Buffer *> &> requestCompleted;
+	Signal<Request *> requestCompleted;
 	Signal<Camera *> disconnected;
 
 	int acquire();
diff --git a/src/cam/capture.cpp b/src/cam/capture.cpp
index 0d7854d674e0a78d..27332df1d55a5c2d 100644
--- a/src/cam/capture.cpp
+++ b/src/cam/capture.cpp
@@ -133,11 +133,13 @@ int Capture::capture(EventLoop *loop)
 	return ret;
 }
 
-void Capture::requestComplete(Request *request, const std::map<Stream *, Buffer *> &buffers)
+void Capture::requestComplete(Request *request)
 {
 	if (request->status() == Request::RequestCancelled)
 		return;
 
+	const std::map<Stream *, Buffer *> &buffers = request->buffers();
+
 	std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
 	double fps = std::chrono::duration_cast<std::chrono::milliseconds>(now - last_).count();
 	fps = last_ != std::chrono::steady_clock::time_point() && fps
diff --git a/src/cam/capture.h b/src/cam/capture.h
index ee0dc421111197c1..4d396afb8c771a74 100644
--- a/src/cam/capture.h
+++ b/src/cam/capture.h
@@ -28,8 +28,7 @@ public:
 private:
 	int capture(EventLoop *loop);
 
-	void requestComplete(libcamera::Request *request,
-			     const std::map<libcamera::Stream *, libcamera::Buffer *> &buffers);
+	void requestComplete(libcamera::Request *request);
 
 	libcamera::Camera *camera_;
 	libcamera::CameraConfiguration *config_;
diff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp
index 76c737cb93813115..e810fb725d81350d 100644
--- a/src/libcamera/camera.cpp
+++ b/src/libcamera/camera.cpp
@@ -919,7 +919,7 @@ void Camera::requestComplete(Request *request)
 			stream->unmapBuffer(buffer);
 	}
 
-	requestCompleted.emit(request, request->buffers());
+	requestCompleted.emit(request);
 	delete request;
 }
 
diff --git a/src/qcam/main_window.cpp b/src/qcam/main_window.cpp
index 3d56309227235fec..cca7365ae75687f9 100644
--- a/src/qcam/main_window.cpp
+++ b/src/qcam/main_window.cpp
@@ -248,12 +248,13 @@ void MainWindow::stopCapture()
 	setWindowTitle(title_);
 }
 
-void MainWindow::requestComplete(Request *request,
-				 const std::map<Stream *, Buffer *> &buffers)
+void MainWindow::requestComplete(Request *request)
 {
 	if (request->status() == Request::RequestCancelled)
 		return;
 
+	const std::map<Stream *, Buffer *> &buffers = request->buffers();
+
 	framesCaptured_++;
 
 	Buffer *buffer = buffers.begin()->second;
diff --git a/src/qcam/main_window.h b/src/qcam/main_window.h
index 30dd8743104d75e0..78511581a8d5c025 100644
--- a/src/qcam/main_window.h
+++ b/src/qcam/main_window.h
@@ -49,8 +49,7 @@ private:
 	int startCapture();
 	void stopCapture();
 
-	void requestComplete(Request *request,
-			     const std::map<Stream *, Buffer *> &buffers);
+	void requestComplete(Request *request);
 	int display(Buffer *buffer);
 
 	QString title_;
diff --git a/test/camera/capture.cpp b/test/camera/capture.cpp
index 791ccad15f7042f9..83f974749affd3cd 100644
--- a/test/camera/capture.cpp
+++ b/test/camera/capture.cpp
@@ -27,11 +27,13 @@ protected:
 		completeBuffersCount_++;
 	}
 
-	void requestComplete(Request *request, const std::map<Stream *, Buffer *> &buffers)
+	void requestComplete(Request *request)
 	{
 		if (request->status() != Request::RequestComplete)
 			return;
 
+		const std::map<Stream *, Buffer *> &buffers = request->buffers();
+
 		completeRequestsCount_++;
 
 		/* Create a new request. */