diff --git a/osu.Game.Rulesets.Tau/Resources/Shaders/sh_PlayfieldMask.fs b/osu.Game.Rulesets.Tau/Resources/Shaders/sh_PlayfieldMask.fs
index 17dafa84..39028c47 100644
--- a/osu.Game.Rulesets.Tau/Resources/Shaders/sh_PlayfieldMask.fs
+++ b/osu.Game.Rulesets.Tau/Resources/Shaders/sh_PlayfieldMask.fs
@@ -17,5 +17,5 @@ lowp vec4 getColourAt(highp vec2 diff, highp vec2 size, lowp vec4 originalColour
 
 void main(void)
 {
-    gl_FragColor = mix(getColourAt(aperturePos - v_Position, apertureSize, v_Colour), vec4(0, 0.0, 0, 1.0), 0);
+    gl_FragColor = mix(getColourAt(aperturePos - v_Position, apertureSize, v_Colour), vec4(0, 0.0, 0, 1.0), 0.0);
 }