diff --git a/src/Surfaces/CircleSurface.cpp b/src/Surfaces/CircleSurface.cpp
index 6183084..a636dc8 100644
--- a/src/Surfaces/CircleSurface.cpp
+++ b/src/Surfaces/CircleSurface.cpp
@@ -29,7 +29,7 @@ void CircleSurface::setup() {
 	updateMask = true;
 //	maskIsReady = false;
 
-	glESVertexShader = STRINGIFY(
+	glESVertexShader = CIRCLE_SURFACE_STRINGIFY(
 			attribute vec4 position;
 			attribute vec4 color;
 			attribute vec4 normal;
@@ -53,7 +53,7 @@ void CircleSurface::setup() {
 			}
 	);
 
-	glESFragmentShader = STRINGIFY(
+	glESFragmentShader = CIRCLE_SURFACE_STRINGIFY(
 //#ifdef GL_ES
 // define default precision for float, vec, mat.
 			precision highp float;
@@ -75,7 +75,7 @@ void CircleSurface::setup() {
 	);
 
 	gl2FragmentShader = "#version 120\n #extension GL_ARB_texture_rectangle : enable\n";
-	gl2FragmentShader += STRINGIFY(
+	gl2FragmentShader += CIRCLE_SURFACE_STRINGIFY(
 			uniform sampler2DRect tex0;
 			uniform sampler2DRect maskTex;
 
diff --git a/src/Surfaces/CircleSurface.h b/src/Surfaces/CircleSurface.h
index 262736d..6a21020 100644
--- a/src/Surfaces/CircleSurface.h
+++ b/src/Surfaces/CircleSurface.h
@@ -8,7 +8,7 @@
 
 #include "QuadSurface.h"
 
-#define STRINGIFY(A) #A
+#define CIRCLE_SURFACE_STRINGIFY(A) #A
 
 namespace ofx {
 namespace piMapper {