diff --git a/src/anytree/exporter/dotexporter.py b/src/anytree/exporter/dotexporter.py
index 4f64dc1..f553b12 100644
--- a/src/anytree/exporter/dotexporter.py
+++ b/src/anytree/exporter/dotexporter.py
@@ -292,9 +292,10 @@ def to_picture(self, filename):
             dotfilename = dotfile.name
             for line in self:
                 dotfile.write((f"{line}\n").encode())
-            dotfile.flush()
-            cmd = ["dot", dotfilename, "-T", fileformat, "-o", filename]
-            check_call(cmd)
+
+        # Call dot outside with block so dotfile is closed to avoid permission issues
+        cmd = ["dot", dotfilename, "-T", fileformat, "-o", filename]
+        check_call(cmd)
         try:
             remove(dotfilename)
         # pylint: disable=broad-exception-caught