diff --git a/core/src/processing/opengl/PGraphicsOpenGL.java b/core/src/processing/opengl/PGraphicsOpenGL.java
index 6ab34bf16..2a03b88bc 100644
--- a/core/src/processing/opengl/PGraphicsOpenGL.java
+++ b/core/src/processing/opengl/PGraphicsOpenGL.java
@@ -695,6 +695,10 @@ public class PGraphicsOpenGL extends PGraphics {
     float f = pgl.getPixelScale();
     pixelWidth = (int)(width * f);
     pixelHeight = (int)(height * f);
+    if (primaryGraphics) {
+      parent.pixelWidth = pixelWidth;
+      parent.pixelHeight = pixelHeight;
+    }
   }