diff --git a/lib/py/Makefile.am b/lib/py/Makefile.am
index a504b5c..adb90f3 100755
--- a/lib/py/Makefile.am
+++ b/lib/py/Makefile.am
@@ -16,7 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-.NOTPARALLEL:
+AUTOMAKE_OPTIONS = serial-tests
 DESTDIR ?= /
 
 all-local: