diff --git a/parso/python/normalizer.py b/parso/python/normalizer.py
index 9afe50b..f1ededb 100644
--- a/parso/python/normalizer.py
+++ b/parso/python/normalizer.py
@@ -313,6 +313,10 @@ class ErrorFinder(Normalizer):
                     # f(+x=1)
                     message = "keyword can't be an expression"
                 self._add_syntax_error(message, first)
+        elif node.type == 'nonlocal_stmt':
+            if self._context.parent_context is None:
+                message = "nonlocal declaration not allowed at module level"
+                self._add_syntax_error(message, node)
 
         yield
 
diff --git a/test/normalizer_issue_files/allowed_syntax.py b/test/normalizer_issue_files/allowed_syntax.py
index 2db3cce..2ed0d48 100644
--- a/test/normalizer_issue_files/allowed_syntax.py
+++ b/test/normalizer_issue_files/allowed_syntax.py
@@ -45,3 +45,7 @@ except:
     pass
 except ZeroDivisionError:
     pass
+
+
+class X():
+    nonlocal a
diff --git a/test/test_python_errors.py b/test/test_python_errors.py
index 4f428d0..615a3f3 100644
--- a/test/test_python_errors.py
+++ b/test/test_python_errors.py
@@ -105,6 +105,7 @@ def test_indentation_errors(code, positions):
         # SyntaxErrors from Python/symtable.c
         'def f(x, x): pass',
         'def x(): from math import *',
+        'nonlocal a',
 
         # IndentationError
         ' foo',