diff --git a/src/cryptography/x509/oid.py b/src/cryptography/x509/oid.py
index f5dc2f8..27fab86 100644
--- a/src/cryptography/x509/oid.py
+++ b/src/cryptography/x509/oid.py
@@ -29,7 +29,7 @@
         if len(nodes) < 2:
             raise ValueError(
                 "Malformed OID: %s (insufficient number of nodes)" % (
-                    self._dotted_string)
+                    self._dotted_string))
 
         if intnodes[0] > 2:
             raise ValueError(