diff --git a/changes/3425.bugfix.rst b/changes/3425.bugfix.rst
new file mode 100644
index 0000000000..71cc147287
--- /dev/null
+++ b/changes/3425.bugfix.rst
@@ -0,0 +1 @@
+Fix ChunkGrid definition (broken in 3.1.2)
diff --git a/src/zarr/core/common.py b/src/zarr/core/common.py
index ed28fd2da4..bebccb65fc 100644
--- a/src/zarr/core/common.py
+++ b/src/zarr/core/common.py
@@ -38,7 +38,7 @@
 BytesLike = bytes | bytearray | memoryview
 ShapeLike = Iterable[int] | int
 # For backwards compatibility
-ChunkCoords: tuple[int, ...]
+ChunkCoords = tuple[int, ...]
 ZarrFormat = Literal[2, 3]
 NodeType = Literal["array", "group"]
 JSON = str | int | float | Mapping[str, "JSON"] | Sequence["JSON"] | None