diff --git a/diagrams/__init__.py b/diagrams/__init__.py
index 147cd0a8..873a44dc 100644
--- a/diagrams/__init__.py
+++ b/diagrams/__init__.py
@@ -191,10 +191,10 @@ class Diagram:
 
     def render(self) -> None:
         if isinstance(self.outformat, list):
-          for one_format in self.outformat:
-            self.dot.render(format=one_format, view=self.show, quiet=True)
+            for one_format in self.outformat:
+                self.dot.render(format=one_format, view=self.show, quiet=True)
         else:
-          self.dot.render(format=self.outformat, view=self.show, quiet=True)
+            self.dot.render(format=self.outformat, view=self.show, quiet=True)
 
 
 class Cluster:
diff --git a/tests/test_diagram.py b/tests/test_diagram.py
index 3346c22c..37d0e831 100644
--- a/tests/test_diagram.py
+++ b/tests/test_diagram.py
@@ -108,16 +108,16 @@ class DiagramTest(unittest.TestCase):
         self.assertTrue(os.path.exists(f"{self.name}.png"))
 
     def test_outformat_list(self):
-      """Check that outformat render all the files from the list."""
-      self.name = 'diagrams_image'
-      with Diagram(show=False, outformat=["dot", "png"]):
-          Node("node1")
-      # both files must exist
-      self.assertTrue(os.path.exists(f"{self.name}.png"))
-      self.assertTrue(os.path.exists(f"{self.name}.dot"))
-
-      # clean the dot file as it only generated here
-      os.remove(self.name + ".dot")
+        """Check that outformat render all the files from the list."""
+        self.name = 'diagrams_image'
+        with Diagram(show=False, outformat=["dot", "png"]):
+            Node("node1")
+        # both files must exist
+        self.assertTrue(os.path.exists(f"{self.name}.png"))
+        self.assertTrue(os.path.exists(f"{self.name}.dot"))
+
+        # clean the dot file as it only generated here
+        os.remove(self.name + ".dot")
 
 
 class ClusterTest(unittest.TestCase):