diff --git a/func_timeout/StoppableThread.py b/func_timeout/StoppableThread.py
index 9b8bb3b..b8092e1 100644
--- a/func_timeout/StoppableThread.py
+++ b/func_timeout/StoppableThread.py
@@ -32,6 +32,7 @@ class StoppableThread(threading.Thread):
 
         The exception is raised over and over, with a specifed delay (default 2.0 seconds)
     '''
+    isNestedStoppableThread = None
 
 
     def _stopThread(self, exception, raiseEvery=2.0):
@@ -41,6 +42,12 @@ class StoppableThread(threading.Thread):
         if self.is_alive() is False:
             return True
 
+        currentThread = threading.current_thread()
+        if issubclass(currentThread.__class__, StoppableThread):
+            currentThread.isNestedStoppableThread = True
+        else:
+            currentThread.isNestedStoppableThread = False
+
         self._stderr = open(os.devnull, 'w')
 
         # Create "joining" thread which will raise the provided exception
diff --git a/func_timeout/dafunc.py b/func_timeout/dafunc.py
index 681a01c..0e8baf0 100644
--- a/func_timeout/dafunc.py
+++ b/func_timeout/dafunc.py
@@ -68,6 +68,9 @@ def func_timeout(timeout, func, args=(), kwargs=None):
             ret.append( func(*args2, **kwargs2) )
         except FunctionTimedOut:
             # Don't print traceback to stderr if we time out
+            currentThread = threading.current_thread()
+            if getattr(currentThread, 'isNestedStoppableThread', False) is True:
+                raise
             pass
         except Exception as e:
             exc_info = sys.exc_info()