diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index a6eb6bf..eefb2ba 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -578,8 +578,8 @@ sba_io_pdir_entry(__le64 *pdir_ptr, space_t sid, phys_addr_t pba,
 	pba &= IOVP_MASK;
 	pba |= (ci >> PAGE_SHIFT) & 0xff;  /* move CI (8 bits) into lowest byte */
 
-	pba |= SBA_PDIR_VALID_BIT;	/* set "valid" bit */
-	*pdir_ptr = cpu_to_le64(pba);	/* swap and store into I/O Pdir */
+	/* set "valid" bit, swap and store into I/O Pdir */
+	*pdir_ptr = cpu_to_le64((unsigned long)pba | SBA_PDIR_VALID_BIT);
 
 	/*
 	 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set