diff --git a/resources/shaders/common.glsl b/resources/shaders/common.glsl
index 677dfe8..98507b1 100644
--- a/resources/shaders/common.glsl
+++ b/resources/shaders/common.glsl
@@ -98,7 +98,7 @@ uniform vec2 uSize;
 uniform float uPadding;
 
 // On GNOME, we set iTexCoord to be an alias for the cogl variables.
-#define iTexCoord cogl_tex_coord_in[0]
+vec2 iTexCoord = cogl_tex_coord_in[0].st;
 
 // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
 vec4 getInputColor(vec2 coords) {