diff --git a/src/renderer/webgl/GlyphRenderer.ts b/src/renderer/webgl/GlyphRenderer.ts
index 3cd5679e..51adc999 100644
--- a/src/renderer/webgl/GlyphRenderer.ts
+++ b/src/renderer/webgl/GlyphRenderer.ts
@@ -55,7 +55,7 @@ void main() {
 }`;
 
 const fragmentShaderSource = `#version 300 es
-precision mediump float;
+precision lowp float;
 
 in vec2 v_texcoord;
 
diff --git a/src/renderer/webgl/RectangleRenderer.ts b/src/renderer/webgl/RectangleRenderer.ts
index 37732703..addc13c5 100644
--- a/src/renderer/webgl/RectangleRenderer.ts
+++ b/src/renderer/webgl/RectangleRenderer.ts
@@ -36,7 +36,7 @@ void main() {
 }`;
 
 const fragmentShaderSource = `#version 300 es
-precision mediump float;
+precision lowp float;
 
 in vec3 v_color;