diff --git a/include/libcamera/internal/mapped_framebuffer.h b/include/libcamera/internal/mapped_framebuffer.h
index 6aaabf50..75ac2c8f 100644
--- a/include/libcamera/internal/mapped_framebuffer.h
+++ b/include/libcamera/internal/mapped_framebuffer.h
@@ -55,6 +55,9 @@ public:
 	using MapFlags = Flags<MapFlag>;
 
 	MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags);
+
+private:
+	const FrameBuffer *buffer_;
 };
 
 LIBCAMERA_FLAGS_ENABLE_OPERATORS(MappedFrameBuffer::MapFlag)
diff --git a/src/libcamera/mapped_framebuffer.cpp b/src/libcamera/mapped_framebuffer.cpp
index f54bbf21..f5ee770c 100644
--- a/src/libcamera/mapped_framebuffer.cpp
+++ b/src/libcamera/mapped_framebuffer.cpp
@@ -238,6 +238,8 @@ MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags)
 
 		planes_.emplace_back(info.address + plane.offset, plane.length);
 	}
+
+	buffer_ = buffer;
 }
 
 } /* namespace libcamera */