diff --git a/java/libraries/opengl/src/processing/opengl/PGL.java b/java/libraries/opengl/src/processing/opengl/PGL.java
index ad096e002..1de9b0908 100644
--- a/java/libraries/opengl/src/processing/opengl/PGL.java
+++ b/java/libraries/opengl/src/processing/opengl/PGL.java
@@ -1067,7 +1067,7 @@ public class PGL {
   }
   
   public void setAdditiveBlend() {
-    gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
+    gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE);;
   }
   
   public void setSubstractiveBlend() {