diff --git a/sphinx_d2lang/d2lang.py b/sphinx_d2lang/d2lang.py
index 6a6d7bb..e7e65d5 100644
--- a/sphinx_d2lang/d2lang.py
+++ b/sphinx_d2lang/d2lang.py
@@ -5,16 +5,20 @@ from docutils.parsers.rst import Directive
 from shutil import which
 import shlex
 import subprocess
+import tempfile
 
 class D2langDirective(Directive):
     has_content = True
     def run(self):
         # TODO : add tempfile for diag_source
+        d2_bin = which('d2')
         outdir = self.state.document.settings.env.app.builder.outdir
         srcdir = self.state.document.settings.env.srcdir
         diag_source = self.content
-        d2_bin = which('d2')
-        cmd_line = 'echo "%s" | %s - %s' % (diag_source, d2_bin, srcdir + "/test.svg")
+        with tempfile.NamedTemporaryFile() as fp:
+            for line in self.content:
+                fp.write(line)
+            cmd_line = '%s %s %s' % (d2_bin, fp.name, srcdir + "/test.svg")
         args = shlex.split(cmd_line)
         subprocess.run(args)
         image_node = nodes.image(uri="/test.svg")