diff --git a/pycparser/c_generator.py b/pycparser/c_generator.py
index 973d24a8..53c26fdf 100644
--- a/pycparser/c_generator.py
+++ b/pycparser/c_generator.py
@@ -59,17 +59,18 @@ def visit_FuncCall(self, n):
         return fref + '(' + self.visit(n.args) + ')'
 
     def visit_UnaryOp(self, n):
-        operand = self._parenthesize_unless_simple(n.expr)
-        if n.op == 'p++':
-            return '%s++' % operand
-        elif n.op == 'p--':
-            return '%s--' % operand
-        elif n.op == 'sizeof':
+        if n.op == 'sizeof':
             # Always parenthesize the argument of sizeof since it can be
             # a name.
             return 'sizeof(%s)' % self.visit(n.expr)
         else:
-            return '%s%s' % (n.op, operand)
+            operand = self._parenthesize_unless_simple(n.expr)
+            if n.op == 'p++':
+                return '%s++' % operand
+            elif n.op == 'p--':
+                return '%s--' % operand
+            else:
+                return '%s%s' % (n.op, operand)
 
     def visit_BinaryOp(self, n):
         lval_str = self._parenthesize_if(n.left,
diff --git a/tests/test_c_generator.py b/tests/test_c_generator.py
index dd19a11a..159c763d 100644
--- a/tests/test_c_generator.py
+++ b/tests/test_c_generator.py
@@ -354,6 +354,13 @@ def test_ptr_decl(self):
         self.assertEqual(generator.visit(ast.ext[0].type.type.type),
                          'const int')
 
+    def test_nested_sizeof(self):
+        src = '1'
+        for _ in range(30):
+            src = 'sizeof(' + src + ')'
+        src = 'int x = ' + src + ';'
+        self._assert_ctoc_correct(src)
+
 
 class TestCasttoC(unittest.TestCase):
     def _find_file(self, name):