diff --git a/core/src/processing/opengl/PGraphicsOpenGL.java b/core/src/processing/opengl/PGraphicsOpenGL.java
index 383581140..368be4a50 100644
--- a/core/src/processing/opengl/PGraphicsOpenGL.java
+++ b/core/src/processing/opengl/PGraphicsOpenGL.java
@@ -53,7 +53,8 @@ public class PGraphicsOpenGL extends PGraphics {
   // Using the technique alternative to finalization described in:
   // http://www.oracle.com/technetwork/articles/java/finalization-137655.html
   static private ReferenceQueue<Object> refQueue = new ReferenceQueue<>();
-  static private List<Disposable<? extends Object>> reachableWeakReferences = new LinkedList<>();
+  private static List<Disposable<? extends Object>> reachableWeakReferences =
+    new LinkedList<>();
 
   static final private int MAX_DRAIN_GLRES_ITERATIONS = 10;