diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f36b46806513..e3145f020271 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -382,8 +382,12 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
 			continue;	/* Wrong type */
 		if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
 			return r;	/* Exact match */
-		if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
-			best = r;	/* Approximating prefetchable by non-prefetchable */
+		/* We can't insert a non-prefetch resource inside a prefetchable parent .. */
+		if (r->flags & IORESOURCE_PREFETCH)
+			continue;
+		/* .. but we can put a prefetchable resource inside a non-prefetchable one */
+		if (!best)
+			best = r;
 	}
 	return best;
 }