diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index 607d8da1e..c0963e09b 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -629,8 +629,6 @@ static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
   struct darwin_cached_device *old_device;
 
   io_service_t device;
-  UInt64 session, locationID;
-  int ret;
 
   usbi_mutex_lock(&active_contexts_lock);
 
@@ -638,7 +636,9 @@ static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
     bool is_reenumerating = false;
 
     /* get the location from the i/o registry */
-    ret = get_ioregistry_value_number (device, CFSTR("sessionID"), kCFNumberSInt64Type, &session);
+    UInt64 session = 0;
+    bool ret = get_ioregistry_value_number (device, CFSTR("sessionID"), kCFNumberSInt64Type, &session);
+    UInt32 locationID = 0;
     (void) get_ioregistry_value_number (device, CFSTR("locationID"), kCFNumberSInt32Type, &locationID);
     IOObjectRelease (device);
     if (!ret)
@@ -652,8 +652,8 @@ static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
         if (old_device->in_reenumerate) {
           /* device is re-enumerating. do not dereference the device at this time. libusb_reset_device()
            * will deref if needed. */
-          usbi_dbg (NULL, "detected device detached due to re-enumeration. sessionID: 0x%" PRIx64 ", locationID: 0x%" PRIx64,
-                    session, locationID);
+          usbi_dbg (NULL, "detected device detached due to re-enumeration. sessionID: 0x%" PRIx64
+                          ", locationID: 0x%" PRIx32, session, locationID);
 
           /* the device object is no longer usable so go ahead and release it */
           if (old_device->device) {
@@ -1287,7 +1287,7 @@ static enum libusb_error darwin_get_cached_device(struct libusb_context *ctx, io
   usbi_mutex_lock(&darwin_cached_devices_mutex);
   do {
     list_for_each_entry(new_device, &darwin_cached_devices, list, struct darwin_cached_device) {
-      usbi_dbg(ctx, "matching sessionID/locationID 0x%" PRIx64 "/0x%x against cached device with sessionID/locationID 0x%" PRIx64 "/0x%x",
+      usbi_dbg(ctx, "matching sessionID/locationID 0x%" PRIx64 "/0x%" PRIx32 " against cached device with sessionID/locationID 0x%" PRIx64 "/0x%" PRIx32,
                sessionID, locationID, new_device->session, new_device->location);
       if (new_device->location == locationID && new_device->in_reenumerate) {
         usbi_dbg (ctx, "found cached device with matching location that is being re-enumerated");
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 3a55cda49..b4ca6bb9c 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11869
+#define LIBUSB_NANO 11870