diff --git a/shader/bicubic.frag b/shader/bicubic.frag
index 645017b..b1a0f0a 100644
--- a/shader/bicubic.frag
+++ b/shader/bicubic.frag
@@ -3,6 +3,7 @@
 // mkxp-z modifications Copyright 2022-2023 Splendide Imaginarius.
 // MIT license.
 
+precision highp float;
 uniform sampler2D texture;
 uniform vec2 sourceSize;
 uniform vec2 texSizeInv;