diff --git a/vala/long_double/float128type.h b/vala/long_double/float128type.h
new file mode 100644
index 0000000..b230774
--- /dev/null
+++ b/vala/long_double/float128type.h
@@ -0,0 +1 @@
+typedef long double double128;
diff --git a/vala/long_double/float128type.vapi b/vala/long_double/float128type.vapi
new file mode 100644
index 0000000..685977d
--- /dev/null
+++ b/vala/long_double/float128type.vapi
@@ -0,0 +1,3 @@
+[CCode (cname = "double128", has_type_id = false, cheader_filename = "float128type.h")]
+public struct Double128 : double {
+}
diff --git a/vala/long_double/run.sh b/vala/long_double/run.sh
new file mode 100755
index 0000000..78478e5
--- /dev/null
+++ b/vala/long_double/run.sh
@@ -0,0 +1 @@
+valac --pkg=float128type --vapidir=. -C test128float.vala && cc -I. `pkg-config --cflags glib-2.0` test128float.c `pkg-config --libs glib-2.0` && ./a.out
diff --git a/vala/long_double/test128float.vala b/vala/long_double/test128float.vala
new file mode 100644
index 0000000..f2107fa
--- /dev/null
+++ b/vala/long_double/test128float.vala
@@ -0,0 +1,17 @@
+void main () {
+	stdout.printf ("sizeof (double) = %lu\n", sizeof(double));
+	stdout.printf ("sizeof (Double128) = %lu\n", sizeof(Double128));
+
+	Double128 d1 = 16.0;
+	stdout.printf ("Double128: 16 ^ 2 = %f\n", d1 * d1);
+
+	double d = 1e-15;
+	stdout.printf ("double: d = %e, ", d);
+	d += 1; d -= 1;
+	stdout.printf ("(+-1) d = %e\n", d);
+
+	Double128 ld = 1e-19;
+	stdout.printf ("Double128: ld = %e, ", ld);
+	ld += 1; ld -= 1;
+	stdout.printf ("(+-1) ld = %e\n", ld);
+}