diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index dd3ee3e6c6ff..6a222d702e13 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -510,7 +510,7 @@ int V4L2CameraProxy::ioctl(unsigned long request, void *arg)
 }
 
 /* \todo make libcamera export these */
-int V4L2CameraProxy::bplMultiplier(unsigned int format)
+unsigned int V4L2CameraProxy::bplMultiplier(uint32_t format)
 {
 	switch (format) {
 	case V4L2_PIX_FMT_NV12:
@@ -535,8 +535,8 @@ int V4L2CameraProxy::bplMultiplier(unsigned int format)
 	};
 }
 
-int V4L2CameraProxy::imageSize(unsigned int format,
-			       unsigned int width, unsigned int height)
+unsigned int V4L2CameraProxy::imageSize(uint32_t format, unsigned int width,
+					unsigned int height)
 {
 	switch (format) {
 	case V4L2_PIX_FMT_NV12:
@@ -563,9 +563,9 @@ int V4L2CameraProxy::imageSize(unsigned int format,
 	};
 }
 
-unsigned int V4L2CameraProxy::v4l2ToDrm(unsigned int pixelformat)
+PixelFormat V4L2CameraProxy::v4l2ToDrm(uint32_t format)
 {
-	switch (pixelformat) {
+	switch (format) {
 	/* RGB formats. */
 	case V4L2_PIX_FMT_RGB24:
 		return DRM_FORMAT_BGR888;
@@ -598,13 +598,13 @@ unsigned int V4L2CameraProxy::v4l2ToDrm(unsigned int pixelformat)
 	case V4L2_PIX_FMT_NV42:
 		return DRM_FORMAT_NV42;
 	default:
-		return pixelformat;
+		return format;
 	};
 }
 
-unsigned int V4L2CameraProxy::drmToV4L2(unsigned int pixelformat)
+uint32_t V4L2CameraProxy::drmToV4L2(PixelFormat format)
 {
-	switch (pixelformat) {
+	switch (format) {
 	/* RGB formats. */
 	case DRM_FORMAT_BGR888:
 		return V4L2_PIX_FMT_RGB24;
@@ -637,6 +637,6 @@ unsigned int V4L2CameraProxy::drmToV4L2(unsigned int pixelformat)
 	case DRM_FORMAT_NV42:
 		return V4L2_PIX_FMT_NV42;
 	default:
-		return pixelformat;
+		return format;
 	}
 }
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index bef0f0afab3b..3d702084f8ff 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -54,12 +54,12 @@ private:
 	int vidioc_streamon(int *arg);
 	int vidioc_streamoff(int *arg);
 
-	static int bplMultiplier(unsigned int format);
-	static int imageSize(unsigned int format, unsigned int width,
-			     unsigned int height);
+	static unsigned int bplMultiplier(uint32_t format);
+	static unsigned int imageSize(uint32_t format, unsigned int width,
+				      unsigned int height);
 
-	static unsigned int v4l2ToDrm(unsigned int pixelformat);
-	static unsigned int drmToV4L2(unsigned int pixelformat);
+	static PixelFormat v4l2ToDrm(uint32_t format);
+	static uint32_t drmToV4L2(PixelFormat format);
 
 	unsigned int refcount_;
 	unsigned int index_;