diff --git a/test/cpp/Makefile.am b/test/cpp/Makefile.am
index 95574fc..ec4ba99 100755
--- a/test/cpp/Makefile.am
+++ b/test/cpp/Makefile.am
@@ -16,6 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 #
+.NOTPARALLEL:
 noinst_LTLIBRARIES = libtestgencpp.la libstresstestgencpp.la
 nodist_libtestgencpp_la_SOURCES = \
 	gen-cpp/ThriftTest_constants.cpp \
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