diff --git a/src/drivers/OpenGL/Fl_OpenGL_Display_Device.cxx b/src/drivers/OpenGL/Fl_OpenGL_Display_Device.cxx
index 27360ccee..121c0dba4 100644
--- a/src/drivers/OpenGL/Fl_OpenGL_Display_Device.cxx
+++ b/src/drivers/OpenGL/Fl_OpenGL_Display_Device.cxx
@@ -58,8 +58,7 @@ Fl_RGB_Image* Fl_Gl_Window_Driver::capture_gl_rectangle(int x, int y, int w, int
   glPixelStorei(GL_PACK_SKIP_ROWS, 0);
   glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
   //
-  int ns = Fl_Window_Driver::driver(glw)->screen_num();
-  float s = Fl::screen_driver()->scale(ns);
+  float s = glw->pixels_per_unit();
   if (s != 1) {
     x = int(x * s); y = int(y * s); w = int(w * s); h = int(h * s);
   }