diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index a234e63c26565709dde5f9cb3e79ac5e9bca77b4..63eebee80e754e7383319b8dc4a3d9ec37ec5e80 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -129,6 +129,8 @@ void __init pci_iommu_alloc(void)
 #ifdef CONFIG_X86_64
 	/* free the range so iommu could get some range less than 4G */
 	dma32_free_bootmem();
+#else
+	dma_ops = &nommu_dma_ops;
 #endif
 	pci_swiotlb_init();
 	if (use_swiotlb)