diff --git a/rodi/__init__.py b/rodi/__init__.py
index 7f27091..b240411 100644
--- a/rodi/__init__.py
+++ b/rodi/__init__.py
@@ -509,7 +509,7 @@ def _get_resolvers_for_parameters(
                 # but at least Optional could be supported in the future
                 raise UnsupportedUnionTypeException(param_name, concrete_type)
 
-            if param_type is _empty:
+            if param_type is _empty or param_type not in services._map:
                 if services.strict:
                     raise CannotResolveParameterException(param_name, concrete_type)
 
@@ -521,6 +521,14 @@ def _get_resolvers_for_parameters(
                 else:
                     aliases = services._aliases[param_name]
 
+                    if not aliases:
+                        cls_name = class_name(param_type)
+                        aliases = (
+                            services._aliases[cls_name]
+                            or services._aliases[cls_name.lower()]
+                            or services._aliases[to_standard_param_name(cls_name)]
+                        )
+
                     if aliases:
                         assert (
                             len(aliases) == 1
@@ -736,6 +744,13 @@ def get(
             scope = ActivationScope(self)
 
         resolver = self._map.get(desired_type)
+        if not resolver:
+            cls_name = class_name(desired_type)
+            resolver = (
+                self._map.get(cls_name)
+                or self._map.get(cls_name.lower())
+                or self._map.get(to_standard_param_name(cls_name))
+            )
         scoped_service = scope.scoped_services.get(desired_type) if scope else None
 
         if not resolver and not scoped_service:
diff --git a/tests/test_fn_exec.py b/tests/test_fn_exec.py
index 541e800..91ff62e 100644
--- a/tests/test_fn_exec.py
+++ b/tests/test_fn_exec.py
@@ -2,6 +2,7 @@
 Functions exec tests.
 exec functions are designed to enable executing any function injecting parameters.
 """
+
 import pytest
 
 from rodi import Container, inject
diff --git a/tests/test_services.py b/tests/test_services.py
index 1015049..942b5b2 100644
--- a/tests/test_services.py
+++ b/tests/test_services.py
@@ -687,6 +687,36 @@ def __init__(self, cats_controller, service_settings):
     assert isinstance(u.cats_controller.cat_request_handler, GetCatRequestHandler)
 
 
+def test_alias_dep_resolving():
+    container = arrange_cats_example()
+
+    class BaseClass:
+        pass
+
+    class DerivedClass(BaseClass):
+        pass
+
+    class UsingAliasByType:
+        def __init__(self, example: BaseClass):
+            self.example = example
+
+    def resolve_derived_class(_) -> DerivedClass:
+        return DerivedClass()
+
+    container.add_scoped_by_factory(resolve_derived_class, DerivedClass)
+    container.add_alias("BaseClass", DerivedClass)
+    container.add_scoped(UsingAliasByType)
+
+    provider = container.build_provider()
+    u = provider.get(UsingAliasByType)
+
+    assert isinstance(u, UsingAliasByType)
+    assert isinstance(u.example, DerivedClass)
+
+    b = provider.get(BaseClass)
+    assert isinstance(b, DerivedClass)
+
+
 def test_get_service_by_name_or_alias():
     container = arrange_cats_example()
     container.add_alias("k", CatsController)
@@ -2323,7 +2353,7 @@ def factory() -> annotation:
 
 def test_factory_without_locals_raises():
     def factory_without_context() -> None:
-        ...
+        pass
 
     with pytest.raises(FactoryMissingContextException):
         _get_factory_annotations_or_throw(factory_without_context)
@@ -2332,7 +2362,7 @@ def factory_without_context() -> None:
 def test_factory_with_locals_get_annotations():
     @inject()
     def factory_without_context() -> "Cat":
-        ...
+        pass
 
     annotations = _get_factory_annotations_or_throw(factory_without_context)
 
@@ -2350,20 +2380,20 @@ def test_deps_github_scenario():
     """
 
     class HTTPClient:
-        ...
+        pass
 
     class CommentsService:
-        ...
+        pass
 
     class ChecksService:
-        ...
+        pass
 
     class CLAHandler:
         comments_service: CommentsService
         checks_service: ChecksService
 
     class GitHubSettings:
-        ...
+        pass
 
     class GitHubAuthHandler:
         settings: GitHubSettings
@@ -2478,7 +2508,7 @@ class B:
 def test_provide_protocol_with_attribute_dependency() -> None:
     class P(Protocol):
         def foo(self) -> Any:
-            ...
+            pass
 
     class Dependency:
         pass
@@ -2506,7 +2536,7 @@ def foo(self) -> Any:
 def test_provide_protocol_with_init_dependency() -> None:
     class P(Protocol):
         def foo(self) -> Any:
-            ...
+            pass
 
     class Dependency:
         pass
@@ -2536,10 +2566,10 @@ def test_provide_protocol_generic() -> None:
 
     class P(Protocol[T]):
         def foo(self, t: T) -> T:
-            ...
+            pass
 
     class A:
-        ...
+        pass
 
     class Impl(P[A]):
         def foo(self, t: A) -> A:
@@ -2562,10 +2592,10 @@ def test_provide_protocol_generic_with_inner_dependency() -> None:
 
     class P(Protocol[T]):
         def foo(self, t: T) -> T:
-            ...
+            pass
 
     class A:
-        ...
+        pass
 
     class Dependency:
         pass