diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c976eb4..4348211 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -466,7 +466,7 @@
 	  If unsure, say Y.
 
 config IOMMU_HELPER
-	def_bool CALGARY_IOMMU
+	def_bool (CALGARY_IOMMU || GART_IOMMU)
 
 # need this always selected by IOMMU for the VIA workaround
 config SWIOTLB