diff --git a/qemu/exec.c b/qemu/exec.c
index 81bf58a9..387f04e2 100644
--- a/qemu/exec.c
+++ b/qemu/exec.c
@@ -774,7 +774,11 @@ hwaddr memory_region_section_get_iotlb(CPUState *cpu,
             iotlb |= PHYS_SECTION_ROM;
         }
     } else {
-        iotlb = section - section->address_space->dispatch->map.sections;
+        AddressSpaceDispatch *d;
+
+        // Unicorn: uses atomic_read instead of atomic_rcu_read
+        d = atomic_read(&section->address_space->dispatch);
+        iotlb = section - d->map.sections;
         iotlb += xlat;
     }