diff --git a/pymysql/cursors.py b/pymysql/cursors.py
index 69a41f4..f17611b 100644
--- a/pymysql/cursors.py
+++ b/pymysql/cursors.py
@@ -12,8 +12,11 @@ from . import err
 #: Regular expression for :meth:`Cursor.executemany`.
 #: executemany only suports simple bulk insert.
 #: You can use it to load large dataset.
-RE_INSERT_VALUES = re.compile(r"""(INSERT\s.+\sVALUES\s+)(\(\s*(?:%s|%\(.+\)s)\s*(?:,\s*(?:%s|%\(.+\)s)\s*)*\))(\s*(?:ON DUPLICATE.*)?)\Z""",
-                              re.IGNORECASE | re.DOTALL)
+RE_INSERT_VALUES = re.compile(
+    r"\s*(INSERT\s.+\sVALUES\s+)" +
+    r"(\(\s*(?:%s|%\(.+\)s)\s*(?:,\s*(?:%s|%\(.+\)s)\s*)*\))" +
+    r"(\s*(?:ON DUPLICATE.*)?)\Z",
+    re.IGNORECASE | re.DOTALL)
 
 
 class Cursor(object):
@@ -170,7 +173,7 @@ class Cursor(object):
 
         m = RE_INSERT_VALUES.match(query)
         if m:
-            q_prefix = m.group(1)
+            q_prefix = m.group(1) % ()
             q_values = m.group(2).rstrip()
             q_postfix = m.group(3) or ''
             assert q_values[0] == '(' and q_values[-1] == ')'
diff --git a/pymysql/tests/test_cursor.py b/pymysql/tests/test_cursor.py
index 34bcaa6..fb0178b 100644
--- a/pymysql/tests/test_cursor.py
+++ b/pymysql/tests/test_cursor.py
@@ -99,3 +99,16 @@ class CursorTest(base.PyMySQLTestCase):
         data_dict = [{'data': i} for i in xrange(10)]
         cursor.executemany("insert into test (data) values (%(data)s)", data_dict)
         self.assertTrue(cursor._executed.endswith(",(7),(8),(9)"), 'execute many with %(data)s not in one query')
+
+        # %% in column set
+        cursor.execute("""\
+            CREATE TABLE percent_test (
+                `A%` INTEGER,
+                `B%` INTEGER)""")
+        try:
+            q = "INSERT INTO percent_test (`A%%`, `B%%`) VALUES (%s, %s)"
+            self.assertIsNotNone(pymysql.cursors.RE_INSERT_VALUES.match(q)
+            cursor.executemany(q, [(3, 4), (5, 6)])
+            self.assertTrue(cursor._executed.endswith("(3, 4),(5, 6)"), "executemany with %% not in one query")
+        finally:
+            cursor.execute("DROP TABLE IF EXISTS percent_test")
diff --git a/runtests.py b/runtests.py
index 367e6ac..00e492b 100755
--- a/runtests.py
+++ b/runtests.py
@@ -10,6 +10,7 @@ if not (PYPY or JYTHON or IRONPYTHON):
 
     @atexit.register
     def report_uncollectable():
+        import gc
         if not gc.garbage:
             print("No garbages!")
             return