diff --git a/pylink/jlink.py b/pylink/jlink.py
index 472f88c..8ef21ba 100644
--- a/pylink/jlink.py
+++ b/pylink/jlink.py
@@ -731,7 +731,7 @@ def open(self, serial_no=None, ip_addr=None):
             # preserved here to simplify workflows using one emulator:
             result = self._dll.JLINKARM_SelectUSB(0)
             if result != 0:
-                raise errors.JlinkException('Could not connect to default emulator.')
+                raise errors.JLinkException('Could not connect to default emulator.')
 
         # Acquire the lock for the J-Link being opened only if the serial
         # number was passed in, otherwise skip it here.  Note that the lock
diff --git a/tests/unit/test_jlink.py b/tests/unit/test_jlink.py
index 7220d65..53e311a 100644
--- a/tests/unit/test_jlink.py
+++ b/tests/unit/test_jlink.py
@@ -570,7 +570,7 @@ def test_jlink_open_unspecified(self):
         Returns:
           ``None``
         """
-        with self.assertRaises(AttributeError):
+        with self.assertRaises(JLinkException):
             self.jlink.open()
 
     def test_jlink_open_unspecified_context_manager(self):
@@ -587,7 +587,7 @@ def test_jlink_open_unspecified_context_manager(self):
         Returns:
           ``None``
         """
-        with self.assertRaises(AttributeError):
+        with self.assertRaises(JLinkException):
             with jlink.JLink(self.lib) as jl:
                 self.assertTrue(jl.opened())  # Opened in CM.
             self.dll.JLINKARM_Close.assert_called()  # Closed on exit.