diff --git a/openhexa/sdk/pipelines/parameter.py b/openhexa/sdk/pipelines/parameter.py
index 565d3b7f..d4faf7e5 100644
--- a/openhexa/sdk/pipelines/parameter.py
+++ b/openhexa/sdk/pipelines/parameter.py
@@ -526,10 +526,12 @@ def _validate_single(self, value: typing.Any):
             normalized_value = self.default
 
         if normalized_value is None:
-            if self.required:
+            if isinstance(self.type, Boolean):
+                normalized_value = False
+            elif self.required:
                 raise ParameterValueError(f"{self.code} is required")
-
-            return None
+            else:
+                return None
 
         pre_validated = self.type.validate(normalized_value)
         if self.choices is not None and pre_validated not in self.choices:
diff --git a/tests/test_parameter.py b/tests/test_parameter.py
index 35eea572..2dfe93e0 100644
--- a/tests/test_parameter.py
+++ b/tests/test_parameter.py
@@ -287,9 +287,13 @@ def test_parameter_validate_single():
     parameter_2 = Parameter("arg2", type=int, default=3)
     assert parameter_2.validate(None) == 3
 
-    # not required, no default
+    # not required, no default - booleans default to False
     parameter_3 = Parameter("arg3", type=bool, required=False)
-    assert parameter_3.validate(None) is None
+    assert parameter_3.validate(None) is False
+
+    # required, no default - booleans default to False
+    parameter_5 = Parameter("arg5", type=bool, required=True)
+    assert parameter_5.validate(None) is False
 
     # choices
     parameter_4 = Parameter("arg4", type=str, choices=["ab", "cd"])