diff --git a/Robust.Client/Graphics/Clyde/Shaders/z-library.glsl b/Robust.Client/Graphics/Clyde/Shaders/z-library.glsl
index 2d26164234..613d8b3c6e 100644
--- a/Robust.Client/Graphics/Clyde/Shaders/z-library.glsl
+++ b/Robust.Client/Graphics/Clyde/Shaders/z-library.glsl
@@ -4,9 +4,10 @@
 // It's literally just called the Z-Library for alphabetical ordering reasons.
 //  - 20kdc
 
-// -- varying/attribute --
+// -- varying/attribute/texture2D --
 
 #ifndef HAS_VARYING_ATTRIBUTE
+#define texture2D texture
 #ifdef VERTEX_SHADER
 #define varying out
 #define attribute in