diff --git a/src/libprs500/devices/prs500/driver.py b/src/libprs500/devices/prs500/driver.py
index 8331791cac..9d83dc1a13 100755
--- a/src/libprs500/devices/prs500/driver.py
+++ b/src/libprs500/devices/prs500/driver.py
@@ -12,7 +12,6 @@
 ##    You should have received a copy of the GNU General Public License along
 ##    with this program; if not, write to the Free Software Foundation, Inc.,
 ##    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-from libprs500.devices import libusb
 
 ### End point description for PRS-500 procductId=667
 ### Endpoint Descriptor:
@@ -227,7 +226,7 @@ class PRS500(Device):
         """
         try:
             return get_device_by_id(cls.VENDOR_ID, cls.PRODUCT_ID) != None
-        except libusb.Error:
+        except USBError:
             return False
 
     def set_progress_reporter(self, report_progress):
diff --git a/src/libprs500/devices/prs505/driver.py b/src/libprs500/devices/prs505/driver.py
index 549528277d..ce6c6120a9 100644
--- a/src/libprs500/devices/prs505/driver.py
+++ b/src/libprs500/devices/prs505/driver.py
@@ -23,7 +23,7 @@ from libprs500.devices.errors import DeviceError, FreeSpaceError
 from libprs500.devices.prs500.books import BookList, fix_ids
 from libprs500 import iswindows, islinux, isosx
 from libprs500.devices.libusb import get_device_by_id
-from libprs500.devices import libusb
+from libprs500.devices.libusb import Error as USBError
 from libprs500.devices.errors import PathError
 
 class File(object):
@@ -117,7 +117,7 @@ class PRS505(Device):
         else:
             try:
                 return get_device_by_id(cls.VENDOR_ID, cls.PRODUCT_ID) != None
-            except libusb.Error:
+            except USBError:
                 return False