diff --git a/src/runtime/shaders/distancefieldtext.vert b/src/runtime/shaders/distancefieldtext.vert
index 879545f..13d94d1 100644
--- a/src/runtime/shaders/distancefieldtext.vert
+++ b/src/runtime/shaders/distancefieldtext.vert
@@ -58,7 +58,7 @@ highp float determinant(highp mat4 m)
 void main()
 {
     highp float scale = fontScale * sqrt(abs(determinant(modelView)));
-    alphas = alphaRange(scale);
+    alphas = alphaRange(fontScale);
     sampleCoord = tCoord * highp vec2(1.0 / highp float(textureWidth), 1.0 / highp float(textureHeight));
     gl_Position = mvp * vCoord;
 }