diff --git a/src/intel/vulkan/anv_allocator.c b/src/intel/vulkan/anv_allocator.c
index f698289155b..4ab5827623e 100644
--- a/src/intel/vulkan/anv_allocator.c
+++ b/src/intel/vulkan/anv_allocator.c
@@ -1397,12 +1397,26 @@ anv_scratch_pool_alloc(struct anv_device *device, struct anv_scratch_pool *pool,
 
    unsigned subslices = MAX2(device->physical->subslice_total, 1);
 
-   /* For, Gen11+, scratch space allocation is based on the number of threads
-    * in the base configuration. */
+   /* The documentation for 3DSTATE_PS "Scratch Space Base Pointer" says:
+    *
+    *    "Scratch Space per slice is computed based on 4 sub-slices.  SW
+    *     must allocate scratch space enough so that each slice has 4
+    *     slices allowed."
+    *
+    * According to the other driver team, this applies to compute shaders
+    * as well.  This is not currently documented at all.
+    *
+    * This hack is no longer necessary on Gen11+.
+    *
+    * For, Gen11+, scratch space allocation is based on the number of threads
+    * in the base configuration.
+    */
    if (devinfo->gen >= 12)
       subslices = devinfo->num_subslices[0];
    else if (devinfo->gen == 11)
       subslices = 8;
+   else if (devinfo->gen >= 9)
+      subslices = 4 * devinfo->num_slices;
 
    unsigned scratch_ids_per_subslice;
    if (devinfo->gen >= 12) {