diff -r eb26255e11f1 Modules/_ctypes/_ctypes.c
--- a/Modules/_ctypes/_ctypes.c	Wed Jan 28 11:06:04 2015 +0200
+++ b/Modules/_ctypes/_ctypes.c	Fri Jan 30 15:53:10 2015 +0900
@@ -583,17 +583,17 @@ CDataType_in_dll(PyObject *type, PyObjec
         return NULL;
     }
 #else
     address = (void *)ctypes_dlsym(handle, name);
     if (!address) {
 #ifdef __CYGWIN__
 /* dlerror() isn't very helpful on cygwin */
         PyErr_Format(PyExc_ValueError,
-                     "symbol '%s' not found (%s) ",
+                     "symbol '%s' not found",
                      name);
 #else
         PyErr_SetString(PyExc_ValueError, ctypes_dlerror());
 #endif
         return NULL;
     }
 #endif
     return PyCData_AtAddress(type, address);
@@ -3269,17 +3269,17 @@ PyCFuncPtr_FromDll(PyTypeObject *type, P
         return NULL;
     }
 #else
     address = (PPROC)ctypes_dlsym(handle, name);
     if (!address) {
 #ifdef __CYGWIN__
 /* dlerror() isn't very helpful on cygwin */
         PyErr_Format(PyExc_AttributeError,
-                     "function '%s' not found (%s) ",
+                     "function '%s' not found",
                      name);
 #else
         PyErr_SetString(PyExc_AttributeError, ctypes_dlerror());
 #endif
         Py_DECREF(ftuple);
         return NULL;
     }
 #endif