diff --git a/test/boot/bootdev.c b/test/boot/bootdev.c
index 23ebc61..c635d06 100644
--- a/test/boot/bootdev.c
+++ b/test/boot/bootdev.c
@@ -16,13 +16,6 @@
 #include <test/ut.h>
 #include "bootstd_common.h"
 
-/* Allow reseting the USB-started flag */
-#if defined(CONFIG_USB_HOST) || defined(CONFIG_USB_GADGET)
-extern bool usb_started;
-#else
-#include <usb.h>
-#endif
-
 /* Check 'bootdev list' command */
 static int bootdev_test_cmd_list(struct unit_test_state *uts)
 {
@@ -197,7 +190,7 @@
 	test_set_skip_delays(true);
 
 	/* Start up USB which gives us three additional bootdevs */
-	usb_started = false;
+	bootstd_reset_usb();
 	ut_assertok(run_command("usb start", 0));
 
 	/*
@@ -313,7 +306,7 @@
 	test_set_eth_enable(false);
 
 	/* Start up USB which gives us three additional bootdevs */
-	usb_started = false;
+	bootstd_reset_usb();
 	ut_assertok(run_command("usb start", 0));
 
 	ut_assertok(bootstd_test_drop_bootdev_order(uts));
@@ -352,7 +345,7 @@
 {
 	struct bootstd_priv *std;
 
-	usb_started = false;
+	bootstd_reset_usb();
 	test_set_skip_delays(true);
 
 	/* get access to the used hunters */
@@ -392,7 +385,7 @@
 	struct bootstd_priv *std;
 
 	test_set_skip_delays(true);
-	usb_started = false;
+	bootstd_reset_usb();
 
 	/* get access to the used hunters */
 	ut_assertok(bootstd_get_priv(&std));
@@ -520,7 +513,7 @@
 /* Check hunting for bootdev of a particular priority */
 static int bootdev_test_hunt_prio(struct unit_test_state *uts)
 {
-	usb_started = false;
+	bootstd_reset_usb();
 	test_set_skip_delays(true);
 
 	ut_assertok(bootdev_hunt_prio(BOOTDEVP_4_SCAN_FAST, false));
@@ -548,7 +541,7 @@
 	struct bootstd_priv *std;
 	int mflags;
 
-	usb_started = false;
+	bootstd_reset_usb();
 
 	/* get access to the used hunters */
 	ut_assertok(bootstd_get_priv(&std));
diff --git a/test/boot/bootstd_common.c b/test/boot/bootstd_common.c
index e505395..ff8ed23 100644
--- a/test/boot/bootstd_common.c
+++ b/test/boot/bootstd_common.c
@@ -11,6 +11,7 @@
 #include <dm.h>
 #include <memalign.h>
 #include <mmc.h>
+#include <usb.h>
 #include <linux/log2.h>
 #include <test/suites.h>
 #include <test/ut.h>
@@ -88,6 +89,11 @@
 	return 0;
 }
 
+void bootstd_reset_usb(void)
+{
+	usb_started = false;
+}
+
 int do_ut_bootstd(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct unit_test *tests = UNIT_TEST_SUITE_START(bootstd_test);
diff --git a/test/boot/bootstd_common.h b/test/boot/bootstd_common.h
index 4a126e4..e29036c 100644
--- a/test/boot/bootstd_common.h
+++ b/test/boot/bootstd_common.h
@@ -53,4 +53,12 @@
  */
 int bootstd_test_check_mmc_hunter(struct unit_test_state *uts);
 
+/**
+ * bootstd_reset_usb() - Reset the USB subsystem
+ *
+ * Resets USB so that it can be started (and scanning) again. This is useful in
+ * tests which need to use USB.
+ */
+void bootstd_reset_usb(void);
+
 #endif