diff --git a/CHANGELOG.md b/CHANGELOG.md
index af490cd0b..ce63e713a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Updates
 
 * `Zones` will now use the new `customHitArea` property introduced in 3.17 to avoid their hit areas from being resized if you specified your own custom hit area (thanks @rexrainbow)
+* The default `BaseShader` vertex shader will now set the `fragCoord` varying to be the viewport height minus the y inPosition. This will give the correct y axis in the fragment shader, causing 'inverted' shaders to display normally when using the default vertex code.
 
 ### Bug Fixes
 
diff --git a/src/display/shader/BaseShader.js b/src/display/shader/BaseShader.js
index 70016ba28..4458911d7 100644
--- a/src/display/shader/BaseShader.js
+++ b/src/display/shader/BaseShader.js
@@ -68,7 +68,7 @@ var BaseShader = new Class({
 
                 'void main () {',
                 'gl_Position = uProjectionMatrix * uViewMatrix * vec4(inPosition, 1.0, 1.0);',
-                'fragCoord = inPosition;',
+                'fragCoord = vec2(inPosition.x, uViewMatrix[2][0] - inPosition.y);',
                 '}'
             ].join('\n');
         }