diff --git a/gsk/gpu/gskgpurenderer.c b/gsk/gpu/gskgpurenderer.c
index 4218fbcfc0..3b68b1abc2 100644
--- a/gsk/gpu/gskgpurenderer.c
+++ b/gsk/gpu/gskgpurenderer.c
@@ -55,11 +55,9 @@ get_render_region (GskGpuRenderer *self)
   GskGpuRendererPrivate *priv = gsk_gpu_renderer_get_instance_private (self);
   const cairo_region_t *damage;
   cairo_region_t *scaled_damage;
-  GdkSurface *surface;
   double scale;
 
-  surface = gdk_draw_context_get_surface (priv->context);
-  scale = gdk_surface_get_scale (surface);
+  scale = gsk_gpu_renderer_get_scale (self);
 
   damage = gdk_draw_context_get_frame_region (priv->context);
   scaled_damage = cairo_region_create ();
@@ -360,6 +358,17 @@ gsk_gpu_renderer_render (GskRenderer          *renderer,
   g_clear_pointer (&render_region, cairo_region_destroy);
 }
 
+static double
+gsk_gpu_renderer_real_get_scale (GskGpuRenderer *self)
+{
+  GskGpuRendererPrivate *priv = gsk_gpu_renderer_get_instance_private (self);
+  GdkSurface *surface;
+
+  surface = gdk_draw_context_get_surface (priv->context);
+
+  return gdk_surface_get_scale (surface);
+}
+
 static void
 gsk_gpu_renderer_class_init (GskGpuRendererClass *klass)
 {
@@ -378,6 +387,7 @@ gsk_gpu_renderer_class_init (GskGpuRendererClass *klass)
   klass->optimizations &= ~gdk_parse_debug_var ("GSK_GPU_SKIP",
                                                 gsk_gpu_optimization_keys,
                                                 G_N_ELEMENTS (gsk_gpu_optimization_keys));
+  klass->get_scale = gsk_gpu_renderer_real_get_scale;
 }
 
 static void
@@ -404,3 +414,8 @@ gsk_gpu_renderer_get_device (GskGpuRenderer *self)
   return priv->device;
 }
 
+double
+gsk_gpu_renderer_get_scale (GskGpuRenderer *self)
+{
+  return GSK_GPU_RENDERER_GET_CLASS (self)->get_scale (self);
+}
diff --git a/gsk/gpu/gskgpurendererprivate.h b/gsk/gpu/gskgpurendererprivate.h
index 8d2c73221a..17ba729f31 100644
--- a/gsk/gpu/gskgpurendererprivate.h
+++ b/gsk/gpu/gskgpurendererprivate.h
@@ -38,10 +38,13 @@ struct _GskGpuRendererClass
   void                  (* wait)                                        (GskGpuRenderer         *self,
                                                                          GskGpuFrame           **frame,
                                                                          gsize                   n_frames);
+
+  double                (*get_scale)                                    (GskGpuRenderer         *self);
 };
 
 GdkDrawContext *        gsk_gpu_renderer_get_context                    (GskGpuRenderer         *self);
 GskGpuDevice *          gsk_gpu_renderer_get_device                     (GskGpuRenderer         *self);
+double                  gsk_gpu_renderer_get_scale                      (GskGpuRenderer         *self);
 
 G_END_DECLS
 
diff --git a/gsk/gpu/gsknglrenderer.c b/gsk/gpu/gsknglrenderer.c
index a0b5478757..71beff87c9 100644
--- a/gsk/gpu/gsknglrenderer.c
+++ b/gsk/gpu/gsknglrenderer.c
@@ -73,11 +73,11 @@ gsk_ngl_renderer_get_backbuffer (GskGpuRenderer *renderer)
   GskNglRenderer *self = GSK_NGL_RENDERER (renderer);
   GdkDrawContext *context;
   GdkSurface *surface;
-  float scale;
+  double scale;
 
   context = gsk_gpu_renderer_get_context (renderer);
   surface = gdk_draw_context_get_surface (context);
-  scale = gdk_surface_get_scale (surface);
+  scale = gsk_gpu_renderer_get_scale (renderer);
 
   if (self->backbuffer == NULL ||
       gsk_gpu_image_get_width (self->backbuffer) != ceil (gdk_surface_get_width (surface) * scale) ||
@@ -100,6 +100,14 @@ gsk_ngl_renderer_wait (GskGpuRenderer  *self,
 {
 }
 
+static double
+gsk_ngl_renderer_get_scale (GskGpuRenderer *self)
+{
+  GdkDrawContext *context = gsk_gpu_renderer_get_context (self);
+
+  return gdk_gl_context_get_scale (GDK_GL_CONTEXT (context));
+}
+
 static void
 gsk_ngl_renderer_class_init (GskNglRendererClass *klass)
 {
@@ -112,6 +120,7 @@ gsk_ngl_renderer_class_init (GskNglRendererClass *klass)
   gpu_renderer_class->make_current = gsk_ngl_renderer_make_current;
   gpu_renderer_class->get_backbuffer = gsk_ngl_renderer_get_backbuffer;
   gpu_renderer_class->wait = gsk_ngl_renderer_wait;
+  gpu_renderer_class->get_scale = gsk_ngl_renderer_get_scale;
 }
 
 static void