diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 5e1f227398a9..11d3c2b120dd 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -96,7 +96,7 @@ V4L2DeviceFormat toV4L2DeviceFormat(const V4L2SubdeviceFormat &format,
 	return deviceFormat;
 }
 
-bool isRaw(PixelFormat &pixFmt)
+bool isRaw(const PixelFormat &pixFmt)
 {
 	/*
 	 * The isRaw test might be redundant right now the pipeline handler only