diff --git a/jedi/evaluate/precedence.py b/jedi/evaluate/precedence.py
index 49a58db6..88783d3a 100644
--- a/jedi/evaluate/precedence.py
+++ b/jedi/evaluate/precedence.py
@@ -86,7 +86,8 @@ def _get_number(iterator, priority=PythonGrammar.LOWEST_PRIORITY):
     if isinstance(el, pr.Operator):
         if el in PythonGrammar.FACTOR:
             right = _get_number(iterator, PythonGrammar.FACTOR_PRIORITY)
-        elif el in PythonGrammar.NOT_TEST and priority <= PythonGrammar.FACTOR_PRIORITY:
+        elif el in PythonGrammar.NOT_TEST \
+                and priority >= PythonGrammar.NOT_TEST_PRIORITY:
             right = _get_number(iterator, PythonGrammar.NOT_TEST_PRIORITY)
         else:
             _syntax_error(el)
diff --git a/test/test_evaluate/test_precedence.py b/test/test_evaluate/test_precedence.py
index 14aa3dea..3fc3ea62 100644
--- a/test/test_evaluate/test_precedence.py
+++ b/test/test_evaluate/test_precedence.py
@@ -24,7 +24,7 @@ def test_simple():
 
 def test_prefixed():
     assert parse_tree('--2') == (None, '-', (None, '-', 2))
-    assert parse_tree('1 and not - 2') == (1, 'and', (None, '-', 2))
+    assert parse_tree('1 and not - 2') == (1, 'and', (None, 'not', (None, '-', 2)))
 
 
 def test_invalid():