diff --git a/apischema/dataclasses/cache.py b/apischema/dataclasses/cache.py
index 4ba654d4..f53d1dda 100644
--- a/apischema/dataclasses/cache.py
+++ b/apischema/dataclasses/cache.py
@@ -346,7 +346,7 @@ def _serialization(
 
 def _deserialization_merged_aliases(cls: Type) -> AbstractSet[str]:
     """Return all aliases used in cls deserialization."""
-    cls = getattr(cls, "__origin__", cls)
+    cls = getattr(cls, "__origin__", None) or cls
     types = get_type_hints(cls, include_extras=True)
     result: Set[str] = set()
     for field in fields_items(cls).values():
diff --git a/docs/changelog.md b/docs/changelog.md
index 979dfcf1..5ae0751c 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.7.6
+
+- Update package description.
+
 ## 0.7.5
 
 - Fix support of `Generic` merged dataclasses.
diff --git a/setup.py b/setup.py
index d0bf5acf..8579d56f 100644
--- a/setup.py
+++ b/setup.py
@@ -5,15 +5,14 @@
 
 setup(
     name="apischema",
-    version="0.7.5",
+    version="0.7.6",
     url="https://github.com/wyfo/apischema",
     author="Joseph Perez",
     author_email="joperez@hotmail.fr",
     license="MIT",
     packages=find_packages(include=["apischema*"]),
     package_data={"apischema": ["py.typed"]},
-    description="Another Python API schema handling and JSON (de)serialization "
-    "through typing annotation; light, simple, powerful.",
+    description="JSON (de)serialization + schema generation through python typing, with a spoonful of sugar.",  # noqa E501
     long_description=README,
     long_description_content_type="text/markdown",
     python_requires=">=3.6",
diff --git a/tests/test_cache.py b/tests/test_cache.py
new file mode 100644
index 00000000..6eb20482
--- /dev/null
+++ b/tests/test_cache.py
@@ -0,0 +1,37 @@
+from dataclasses import InitVar, dataclass, field
+from typing import Generic, TypeVar
+
+from apischema.dataclasses.cache import _deserialization_merged_aliases
+from apischema.metadata import merged
+
+
+@dataclass
+class A:
+    a: int
+    b: "B" = field(metadata=merged)
+    c: "C[int]" = field(metadata=merged)
+    d: "D" = field(metadata=merged)
+    e: InitVar[int]
+    f: int = field(init=False)
+
+
+@dataclass
+class B:
+    g: int
+
+
+T = TypeVar("T")
+
+
+@dataclass
+class C(Generic[T]):
+    h: T
+
+
+@dataclass
+class D(Generic[T]):
+    i: T
+
+
+def test_merged_aliases():
+    assert _deserialization_merged_aliases(A) == {"a", "g", "h", "i", "e"}