diff --git a/pylode/profiles/ontpub.py b/pylode/profiles/ontpub.py
index de0dcbe..7032e7d 100644
--- a/pylode/profiles/ontpub.py
+++ b/pylode/profiles/ontpub.py
@@ -146,7 +146,7 @@ def make_html(self, destination: Path = None, include_css: bool = True):
         self._make_body()
 
         if destination is not None:
-            open(destination, "w").write(self.doc.render())
+            open(destination, "w", encoding="utf8").write(self.doc.render())
         else:
             return self.doc.render()
 
diff --git a/pylode/profiles/vocpub.py b/pylode/profiles/vocpub.py
index 956c9cf..acd6f2f 100644
--- a/pylode/profiles/vocpub.py
+++ b/pylode/profiles/vocpub.py
@@ -149,7 +149,7 @@ def make_html(self, destination: Path = None, include_css: bool = True):
         self._make_body()
 
         if destination is not None:
-            open(destination, "w").write(self.doc.render())
+            open(destination, "w", encoding="utf8").write(self.doc.render())
         else:
             return self.doc.render()