diff --git a/drivers/net/e1000/e1000_hw.h b/drivers/net/e1000/e1000_hw.h
index 31bea32158417cfcee03f93269294e57f8970b31..f247f264a57b7b83e255a44647d0844f2997d238 100644
--- a/drivers/net/e1000/e1000_hw.h
+++ b/drivers/net/e1000/e1000_hw.h
@@ -128,11 +128,13 @@ typedef enum {
 /* PCI bus widths */
 typedef enum {
     e1000_bus_width_unknown = 0,
+    /* These PCIe values should literally match the possible return values
+     * from config space */
+    e1000_bus_width_pciex_1 = 1,
+    e1000_bus_width_pciex_2 = 2,
+    e1000_bus_width_pciex_4 = 4,
     e1000_bus_width_32,
     e1000_bus_width_64,
-    e1000_bus_width_pciex_1,
-    e1000_bus_width_pciex_2,
-    e1000_bus_width_pciex_4,
     e1000_bus_width_reserved
 } e1000_bus_width;