diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 95ba3caeb401..edb2fb223335 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -36,7 +36,7 @@
 
 #define DART_MAX_STREAMS 256
 #define DART_MAX_TTBR 4
-#define MAX_DARTS_PER_DEVICE 2
+#define MAX_DARTS_PER_DEVICE 3
 
 /* Common registers */