diff --git a/data/shader/depth.fsh b/data/shader/depth.fsh
index 4e98194..55941b6 100644
--- a/data/shader/depth.fsh
+++ b/data/shader/depth.fsh
@@ -1,7 +1,5 @@
 #version 150
 
-out float gl_FragDepth;
-
 void main() {
     gl_FragDepth = gl_FragCoord.z;
 }
diff --git a/data/shader/depth_cube.fsh b/data/shader/depth_cube.fsh
index adf8a69..8042a49 100644
--- a/data/shader/depth_cube.fsh
+++ b/data/shader/depth_cube.fsh
@@ -4,8 +4,6 @@ in vec4 fragPosition;
 
 uniform float farPlane;
 
-out float gl_FragDepth;
-
 void main() {
     float nearPlane = 0.1;
     float A = -(farPlane+nearPlane)/(farPlane-nearPlane);