diff --git a/src/soc/amd/stoneyridge/enable_usbdebug.c b/src/soc/amd/stoneyridge/enable_usbdebug.c
index 0a0c3ec66d..27ac61f980 100644
--- a/src/soc/amd/stoneyridge/enable_usbdebug.c
+++ b/src/soc/amd/stoneyridge/enable_usbdebug.c
@@ -26,8 +26,8 @@
 pci_devfn_t pci_ehci_dbg_dev(unsigned int hcd_idx)
 {
 	/* Enable all of the USB controllers */
-	outb(0xef, PM_INDEX);
-	outb(0x7f, PM_DATA);
+	outb(PM_USB_ENABLE, PM_INDEX);
+	outb(PM_USB_ALL_CONTROLLERS, PM_DATA);
 
 	return SOC_EHCI1_DEV;
 }
diff --git a/src/soc/amd/stoneyridge/include/soc/southbridge.h b/src/soc/amd/stoneyridge/include/soc/southbridge.h
index ce0af95a20..b9dc62a76e 100644
--- a/src/soc/amd/stoneyridge/include/soc/southbridge.h
+++ b/src/soc/amd/stoneyridge/include/soc/southbridge.h
@@ -101,6 +101,8 @@
 #define   PM_LPC_AB_NO_BYPASS_EN	BIT(2)
 #define   PM_LPC_A20_EN			BIT(1)
 #define   PM_LPC_ENABLE			BIT(0)
+#define PM_USB_ENABLE			0xef
+#define   PM_USB_ALL_CONTROLLERS	0x7f
 
 /* FCH MISC Registers 0xfed80e00 */
 #define GPP_CLK_CNTRL			0x00