diff --git a/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java b/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
index 93a8e141..b54181cf 100644
--- a/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
+++ b/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
@@ -47,9 +47,10 @@ public class Capabilities {
             this.subgroup = testShaderCompilesOk(ShaderType.COMPUTE, """
                 #version 430
                 #extension GL_KHR_shader_subgroup_basic : require
+                #extension GL_KHR_shader_subgroup_arithmetic : require
                 layout(local_size_x=32) in;
                 void main() {
-                    uint64_t a = 1234;
+                    uint a = subgroupExclusiveAdd(gl_LocalInvocationIndex);
                 }
                 """);
         } else {
diff --git a/src/main/resources/assets/voxy/shaders/util/prefixsum/simple.comp b/src/main/resources/assets/voxy/shaders/util/prefixsum/simple.comp
index 0197ef24..52e9c9b4 100644
--- a/src/main/resources/assets/voxy/shaders/util/prefixsum/simple.comp
+++ b/src/main/resources/assets/voxy/shaders/util/prefixsum/simple.comp
@@ -1,8 +1,4 @@
 #version 460
-
-#extension GL_KHR_shader_subgroup_basic : require
-#extension GL_KHR_shader_subgroup_arithmetic: require
-
 #define WORK_SIZE 256
 
 //Does inital parralel prefix sum on batches of WORK_SIZE