diff --git a/Libraries/LibGfx/PaintingSurface.cpp b/Libraries/LibGfx/PaintingSurface.cpp
index 48a554f7326..9a982330574 100644
--- a/Libraries/LibGfx/PaintingSurface.cpp
+++ b/Libraries/LibGfx/PaintingSurface.cpp
@@ -85,7 +85,7 @@ void PaintingSurface::read_into_bitmap(Gfx::Bitmap& bitmap)
     m_impl->surface->readPixels(pixmap, 0, 0);
 }
 
-void PaintingSurface::write_from_bitmap(Gfx::Bitmap& bitmap)
+void PaintingSurface::write_from_bitmap(Gfx::Bitmap const& bitmap)
 {
     auto color_type = to_skia_color_type(bitmap.format());
     auto alpha_type = bitmap.alpha_type() == Gfx::AlphaType::Premultiplied ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
diff --git a/Libraries/LibGfx/PaintingSurface.h b/Libraries/LibGfx/PaintingSurface.h
index 33797606be3..a070b62d0aa 100644
--- a/Libraries/LibGfx/PaintingSurface.h
+++ b/Libraries/LibGfx/PaintingSurface.h
@@ -32,7 +32,7 @@ public:
 #endif
 
     void read_into_bitmap(Bitmap&);
-    void write_from_bitmap(Bitmap&);
+    void write_from_bitmap(Bitmap const&);
 
     void notify_content_will_change();