diff --git a/test/py/Makefile.am b/test/py/Makefile.am
old mode 100644
new mode 100755
index 2317ef6..6b31769
--- a/test/py/Makefile.am
+++ b/test/py/Makefile.am
@@ -16,7 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-
+.NOTPARALLEL:
 THRIFT = $(top_srcdir)/compiler/cpp/thrift
 
 py_unit_tests = RunClientServer.py