diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 7631dc3961c1281bf1ca5b9374e332fbd101d1e9..379cde59988cfed7582f2ad038ce41a6d0a83766 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -264,8 +264,7 @@ static int rockchip_pcie_ep_map_addr(struct pci_epc *epc, u8 fn,
 	struct rockchip_pcie *pcie = &ep->rockchip;
 	u32 r;
 
-	r = find_first_zero_bit(&ep->ob_region_map,
-				sizeof(ep->ob_region_map) * BITS_PER_LONG);
+	r = find_first_zero_bit(&ep->ob_region_map, BITS_PER_LONG);
 	/*
 	 * Region 0 is reserved for configuration space and shouldn't
 	 * be used elsewhere per TRM, so leave it out.