diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index f853003d3fa6..4cf120ebe5ad 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1333,7 +1333,14 @@ static void pbus_size_mem(struct pci_bus *bus, struct resource *b_res,
 			r_size = resource_size(r);
 			size += max(r_size, align);
 
-			aligns[order] += align;
+			/*
+			 * If resource's size is larger than its alignment,
+			 * some configurations result in an unwanted gap in
+			 * the head space that the larger resource cannot
+			 * fill.
+			 */
+			if (r_size <= align)
+				aligns[order] += align;
 			if (order > max_order)
 				max_order = order;
 		}