diff --git a/app/shaders/cornerpin.frag b/app/shaders/cornerpin.frag
index 7dd7e3306..84b9ece6b 100644
--- a/app/shaders/cornerpin.frag
+++ b/app/shaders/cornerpin.frag
@@ -1,3 +1,5 @@
+#version 130
+
 // Input texture
 uniform sampler2D ove_maintex;
 uniform sampler2D tex_in;