diff --git a/lib/c_glib/Makefile.am b/lib/c_glib/Makefile.am
index 39e848a..86d4884 100755
--- a/lib/c_glib/Makefile.am
+++ b/lib/c_glib/Makefile.am
@@ -16,7 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-.NOTPARALLEL:
+AUTOMAKE_OPTIONS = serial-tests
 SUBDIRS = . test
 
 pkgconfigdir = $(libdir)/pkgconfig
diff --git a/lib/c_glib/test/Makefile.am b/lib/c_glib/test/Makefile.am
index 72d0f64..c8d2393 100755
--- a/lib/c_glib/test/Makefile.am
+++ b/lib/c_glib/test/Makefile.am
@@ -16,7 +16,8 @@
 # specific language governing permissions and limitations
 # under the License.
 #
-.NOTPARALLEL:
+AUTOMAKE_OPTIONS = serial-tests
+
 SUBDIRS =
 
 AM_CPPFLAGS = -g -Wall -I../src $(GLIB_CFLAGS)