diff --git a/bindings/python/capstone/__init__.py b/bindings/python/capstone/__init__.py
index c6c1c8e0..b9a94eef 100644
--- a/bindings/python/capstone/__init__.py
+++ b/bindings/python/capstone/__init__.py
@@ -337,7 +337,7 @@ class _cs_insn(ctypes.Structure):
     )
 
 # callback for SKIPDATA option
-CS_SKIPDATA_CALLBACK = ctypes.CFUNCTYPE(ctypes.c_size_t, ctypes.POINTER(ctypes.c_char), ctypes.c_size_t, ctypes.c_void_p)
+CS_SKIPDATA_CALLBACK = ctypes.CFUNCTYPE(ctypes.c_size_t, ctypes.POINTER(ctypes.c_char), ctypes.c_size_t, ctypes.c_size_t, ctypes.c_void_p)
 
 class _cs_opt_skipdata(ctypes.Structure):
     _fields_ = (