diff --git a/arch/arm/plat-orion/pcie.c b/arch/arm/plat-orion/pcie.c
index d41d41d78ad98676dea41aeb6466fb1ebf2bb811..54c84a492a0f0ab95de7ffa1590e0c5cf5259dc1 100644
--- a/arch/arm/plat-orion/pcie.c
+++ b/arch/arm/plat-orion/pcie.c
@@ -132,6 +132,12 @@ static void __init orion_pcie_setup_wins(void __iomem *base,
 		size += cs->size;
 	}
 
+	/*
+	 * Round up 'size' to the nearest power of two.
+	 */
+	if ((size & (size - 1)) != 0)
+		size = 1 << fls(size);
+
 	/*
 	 * Setup BAR[1] to all DRAM banks.
 	 */