diff --git a/hw/arm/smmuv3-internal.h b/hw/arm/smmuv3-internal.h
index 5babf72f7d..ef093eaff5 100644
--- a/hw/arm/smmuv3-internal.h
+++ b/hw/arm/smmuv3-internal.h
@@ -63,7 +63,7 @@ REG32(IDR5,                0x14)
 
 #define SMMU_IDR5_OAS 4
 
-REG32(IIDR,                0x1c)
+REG32(IIDR,                0x18)
 REG32(CR0,                 0x20)
     FIELD(CR0, SMMU_ENABLE,   0, 1)
     FIELD(CR0, EVENTQEN,      2, 1)