diff --git a/source/blender/draw/engines/workbench/shaders/workbench_shadow_caps_geom.glsl b/source/blender/draw/engines/workbench/shaders/workbench_shadow_caps_geom.glsl
index a62e8837538..0d71db45f2e 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_shadow_caps_geom.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_shadow_caps_geom.glsl
@@ -2,10 +2,6 @@
  *
  * SPDX-License-Identifier: GPL-2.0-or-later */
 
-#ifdef GPU_ARB_gpu_shader5
-#  define USE_INVOC_EXT
-#endif
-
 vec4 get_pos(int v, bool backface)
 {
   return (backface) ? vData[v].backPosition : vData[v].frontPosition;
@@ -54,12 +50,7 @@ void main()
 #endif
 
   if (!is_manifold || !backface) {
-#ifdef USE_INVOC_EXT
     bool do_front = (gl_InvocationID & 1) == 0;
     emit_cap(do_front, invert);
-#else
-    emit_cap(true, invert);
-    emit_cap(false, invert);
-#endif
   }
 }
diff --git a/source/blender/draw/engines/workbench/shaders/workbench_shadow_geom.glsl b/source/blender/draw/engines/workbench/shaders/workbench_shadow_geom.glsl
index fac6cdc143f..2cab47dc881 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_shadow_geom.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_shadow_geom.glsl
@@ -2,10 +2,6 @@
  *
  * SPDX-License-Identifier: GPL-2.0-or-later */
 
-#ifdef GPU_ARB_gpu_shader5
-#  define USE_INVOC_EXT
-#endif
-
 #define DEGENERATE_TRIS_WORKAROUND
 #define DEGENERATE_TRIS_AREA_THRESHOLD 4e-17
 
@@ -74,23 +70,13 @@ void main()
     return;
   }
 
-#ifdef USE_INVOC_EXT
   if (gl_InvocationID == 0) {
     extrude_edge(backface.x);
   }
   else if (is_manifold) {
-#  ifdef DOUBLE_MANIFOLD
+#ifdef DOUBLE_MANIFOLD
     /* Increment/Decrement twice for manifold edges. */
     extrude_edge(backface.x);
-#  endif
-  }
-#else
-  extrude_edge(backface.x);
-  if (is_manifold) {
-#  ifdef DOUBLE_MANIFOLD
-    /* Increment/Decrement twice for manifold edges. */
-    extrude_edge(backface.x);
-#  endif
-  }
 #endif
+  }
 }
diff --git a/source/blender/gpu/intern/gpu_shader_create_info.hh b/source/blender/gpu/intern/gpu_shader_create_info.hh
index 5a38b9c4dc5..95dacd65956 100644
--- a/source/blender/gpu/intern/gpu_shader_create_info.hh
+++ b/source/blender/gpu/intern/gpu_shader_create_info.hh
@@ -668,12 +668,6 @@ struct ShaderCreateInfo {
     return *(Self *)this;
   }
 
-  /**
-   * IMPORTANT: invocations count is only used if GL_ARB_gpu_shader5 is supported. On
-   * implementations that do not supports it, the max_vertices will be multiplied by invocations.
-   * Your shader needs to account for this fact. Use `#ifdef GPU_ARB_gpu_shader5` and make a code
-   * path that does not rely on #gl_InvocationID.
-   */
   Self &geometry_layout(PrimitiveIn prim_in,
                         PrimitiveOut prim_out,
                         int max_vertices,