diff --git a/core/src/processing/opengl/PShader.java b/core/src/processing/opengl/PShader.java
index 0f2c92490..a6e37b84e 100644
--- a/core/src/processing/opengl/PShader.java
+++ b/core/src/processing/opengl/PShader.java
@@ -117,7 +117,7 @@ public class PShader implements PConstants {
   protected int modelviewMatLoc;
   protected int projectionMatLoc;
   protected int ppixelsLoc;
-  protected int bufferUnit;
+  protected int ppixelsUnit;
   protected int viewportLoc;
 
   // Uniforms only for lines and points
@@ -1210,12 +1210,12 @@ public class PShader implements PConstants {
     }
 
     if (-1 < ppixelsLoc) {
-      bufferUnit = getLastTexUnit() + 1;
-      setUniformValue(ppixelsLoc, bufferUnit);
-      pgl.activeTexture(PGL.TEXTURE0 + bufferUnit);
+      ppixelsUnit = getLastTexUnit() + 1;
+      setUniformValue(ppixelsLoc, ppixelsUnit);
+      pgl.activeTexture(PGL.TEXTURE0 + ppixelsUnit);
       currentPG.bindFrontTexture();
     } else {
-      bufferUnit = -1;
+      ppixelsUnit = -1;
     }
   }
 
@@ -1306,7 +1306,7 @@ public class PShader implements PConstants {
 
     if (-1 < ppixelsLoc) {
       pgl.requestFBOLayer();
-      pgl.activeTexture(PGL.TEXTURE0 + bufferUnit);
+      pgl.activeTexture(PGL.TEXTURE0 + ppixelsUnit);
       currentPG.unbindFrontTexture();
       pgl.activeTexture(PGL.TEXTURE0);
     }
@@ -1341,7 +1341,7 @@ public class PShader implements PConstants {
       setUniformValue(texOffsetLoc, 1.0f / tex.width, 1.0f / tex.height);
 
       if (-1 < textureLoc) {
-        texUnit =  -1 < bufferUnit ? bufferUnit + 1 : getLastTexUnit() + 1;
+        texUnit =  -1 < ppixelsUnit ? ppixelsUnit + 1 : getLastTexUnit() + 1;
         setUniformValue(textureLoc, texUnit);
         pgl.activeTexture(PGL.TEXTURE0 + texUnit);
         tex.bind();