diff --git a/greentest/test_threading.py b/greentest/test_threading.py
index 93f2506..08bf39d 100644
--- a/greentest/test_threading.py
+++ b/greentest/test_threading.py
@@ -87,30 +87,31 @@ class ThreadTests(unittest.TestCase):
         self.assertEqual(numrunning.get(), 0)
 
     # run with a small(ish) thread stack size (256kB)
-    def test_various_ops_small_stack(self):
-        if verbose:
-            print 'with 256kB thread stack size...'
-        try:
-            threading.stack_size(262144)
-        except thread.error:
+    if hasattr(threading, 'stack_size'):
+        def test_various_ops_small_stack(self):
             if verbose:
-                print 'platform does not support changing thread stack size'
-            return
-        self.test_various_ops()
-        threading.stack_size(0)
+                print 'with 256kB thread stack size...'
+            try:
+                threading.stack_size(262144)
+            except thread.error:
+                if verbose:
+                    print 'platform does not support changing thread stack size'
+                return
+            self.test_various_ops()
+            threading.stack_size(0)
 
-    # run with a large thread stack size (1MB)
-    def test_various_ops_large_stack(self):
-        if verbose:
-            print 'with 1MB thread stack size...'
-        try:
-            threading.stack_size(0x100000)
-        except thread.error:
+        # run with a large thread stack size (1MB)
+        def test_various_ops_large_stack(self):
             if verbose:
-                print 'platform does not support changing thread stack size'
-            return
-        self.test_various_ops()
-        threading.stack_size(0)
+                print 'with 1MB thread stack size...'
+            try:
+                threading.stack_size(0x100000)
+            except thread.error:
+                if verbose:
+                    print 'platform does not support changing thread stack size'
+                return
+            self.test_various_ops()
+            threading.stack_size(0)
 
     def test_foreign_thread(self):
         # Check that a "foreign" thread can use the threading module.