diff --git a/src/shaders/background.vertex.glsl b/src/shaders/background.vertex.glsl
index 1892226aed8..9e5ab1b7b52 100644
--- a/src/shaders/background.vertex.glsl
+++ b/src/shaders/background.vertex.glsl
@@ -3,7 +3,7 @@ attribute vec2 a_pos;
 uniform mat4 u_matrix;
 
 #ifdef LIGHTING_3D_MODE
-uniform vec4 u_color;
+uniform mediump vec4 u_color;
 varying vec4 v_color;
 #endif