diff --git a/ntd2d/ntd2d_action/sphinxdocs.py b/ntd2d/ntd2d_action/sphinxdocs.py
index 3892339..fedd2ce 100644
--- a/ntd2d/ntd2d_action/sphinxdocs.py
+++ b/ntd2d/ntd2d_action/sphinxdocs.py
@@ -76,6 +76,8 @@ def build_docs(self, build_command):
                     build_command,
                     env=dict(os.environ, SPHINXOPTS=sphinx_options),
                     cwd=self.docs_dir.as_posix(),
+                    bufsize=1,
+                    text=True,
                     check=True
                 )
             else:
@@ -85,6 +87,8 @@ def build_docs(self, build_command):
                 subprocess.run(
                     build_command,
                     cwd=self.docs_dir.as_posix(),
+                    bufsize=1,
+                    text=True,
                     check=True
                 )