diff --git a/src/libcamera/include/v4l2_subdevice.h b/src/libcamera/include/v4l2_subdevice.h
index 8fd66607..82fa6685 100644
--- a/src/libcamera/include/v4l2_subdevice.h
+++ b/src/libcamera/include/v4l2_subdevice.h
@@ -11,6 +11,7 @@
 
 namespace libcamera {
 
+class MediaEntity;
 struct Rectangle;
 
 struct V4L2SubdeviceFormat {