diff --git a/arch/powerpc/sysdev/u3_iommu.c b/arch/powerpc/sysdev/u3_iommu.c
index 543d65909812..f32baf7f4693 100644
--- a/arch/powerpc/sysdev/u3_iommu.c
+++ b/arch/powerpc/sysdev/u3_iommu.c
@@ -226,7 +226,7 @@ static void iommu_table_u3_setup(void)
 	iommu_table_u3.it_busno = 0;
 	iommu_table_u3.it_offset = 0;
 	/* it_size is in number of entries */
-	iommu_table_u3.it_size = dart_tablesize / sizeof(u32);
+	iommu_table_u3.it_size = (dart_tablesize / sizeof(u32)) >> DART_PAGE_FACTOR;
 
 	/* Initialize the common IOMMU code */
 	iommu_table_u3.it_base = (unsigned long)dart_vbase;