diff --git a/MySQLdb/cursors.py b/MySQLdb/cursors.py
index 1e0a3f9..75b9aee 100644
--- a/MySQLdb/cursors.py
+++ b/MySQLdb/cursors.py
@@ -358,7 +358,7 @@ class BaseCursor(object):
                              ','.join(['@_%s_%d' % (procname, i)
                                        for i in range(len(args))]))
         if isinstance(q, unicode):
-            q = q.encode(db.unicode_literal.charset)
+            q = q.encode(db.unicode_literal.charset, 'surrogateescape')
         self._query(q)
         self._executed = q
         if not self._defer_warnings: