diff --git a/pyopencl/_cffi.py b/pyopencl/_cffi.py
index 6df057d61251c538b0463b1b7f737bbc1a4d9c96..3944bbf106d746343c0287977843293e4206be65 100644
--- a/pyopencl/_cffi.py
+++ b/pyopencl/_cffi.py
@@ -215,6 +215,8 @@ import gc
 _py_gc = _ffi.callback('int(void)')(gc.collect)
 
 _pyrefs = {}
+
+
 @_ffi.callback('void(void*)')
 def _py_deref(handle):
     try:
@@ -222,6 +224,7 @@ def _py_deref(handle):
     except:
         pass
 
+
 # return a new reference of the object pointed to by the handle.
 # The return value might be different with the input (on PyPy).
 # _py_deref should be called (once) when the object is not needed anymore.
@@ -232,6 +235,7 @@ def _py_ref(handle):
     _pyrefs[handle] = handle
     return handle
 
+
 @_ffi.callback('void(void*, cl_int)')
 def _py_call(handle, status):
     _ffi.from_handle(handle)(status)