diff --git a/jedi/inference/compiled/value.py b/jedi/inference/compiled/value.py
index 61b134ad..841c3794 100644
--- a/jedi/inference/compiled/value.py
+++ b/jedi/inference/compiled/value.py
@@ -378,6 +378,9 @@ class SignatureParamName(ParamNameInterface, AbstractNameDefinition):
         s = self._kind_string() + self.string_name
         if self._signature_param.has_annotation:
             s += ': ' + self._signature_param.annotation_string
+        if re.fullmatch(r'Optional\[.+\]',
+                        self._signature_param.annotation_string) is not None:
+            return s
         if self._signature_param.has_default:
             s += '=' + self._signature_param.default_string
         return s