diff --git a/changes/4361-hramezani.md b/changes/4361-hramezani.md
new file mode 100644
index 00000000000..72d9a7936d0
--- /dev/null
+++ b/changes/4361-hramezani.md
@@ -0,0 +1 @@
+Fix `__post_init_post_parse__` is incorrectly passed keyword arguments when no `__post_init__` is defined
diff --git a/pydantic/dataclasses.py b/pydantic/dataclasses.py
index 23178cf8f7e..abfe7d1322f 100644
--- a/pydantic/dataclasses.py
+++ b/pydantic/dataclasses.py
@@ -310,8 +310,10 @@ def new_init(self: 'Dataclass', *args: Any, **kwargs: Any) -> None:
                             # set arg value by default
                             initvars_and_values[f.name] = args[i]
                         except IndexError:
-                            initvars_and_values[f.name] = f.default
-                initvars_and_values.update(kwargs)
+                            if f.name in kwargs:
+                                initvars_and_values[f.name] = kwargs[f.name]
+                            else:
+                                initvars_and_values[f.name] = f.default
 
                 self.__post_init_post_parse__(**initvars_and_values)
 
diff --git a/tests/test_dataclasses.py b/tests/test_dataclasses.py
index f74b0874854..56ed9bf398f 100644
--- a/tests/test_dataclasses.py
+++ b/tests/test_dataclasses.py
@@ -600,6 +600,17 @@ def __post_init_post_parse__(self, base_path):
     assert PathDataPostInitPostParse('world', base_path='/hello').path == Path('/hello/world')
 
 
+def test_post_init_post_parse_without_initvars():
+    @pydantic.dataclasses.dataclass
+    class Foo:
+        a: int
+
+        def __post_init_post_parse__(self):
+            ...
+
+    Foo(a=1)
+
+
 def test_classvar():
     @pydantic.dataclasses.dataclass
     class TestClassVar: