diff --git a/src/unihan_db/importer.py b/src/unihan_db/importer.py
index 8768ebd5..51feafb2 100644
--- a/src/unihan_db/importer.py
+++ b/src/unihan_db/importer.py
@@ -58,16 +58,17 @@ def import_char(
             t.Dict[str, object],
         ],
     ],
-):  # NOQA: C901
+) -> None:  # NOQA: C901
     if "kDefinition" in char:
-        for d in char["kDefinition"]:
-            c.kDefinition.append(kDefinition(definition=d))
+        for kd in char["kDefinition"]:
+            c.kDefinition.append(kDefinition(definition=kd))
     if "kCantonese" in char:
-        for d in char["kCantonese"]:
-            c.kCantonese.append(kCantonese(definition=d))
+        for kc in char["kCantonese"]:
+            c.kCantonese.append(kCantonese(definition=kc))
     if "kCCCII" in char:
-        for d in char["kCCCII"]:
-            c.kCCCII.append(kCCCII(hex=d))
+        for kci in char["kCCCII"]:
+            assert isinstance(kci, dict)
+            c.kCCCII.append(kCCCII(hex=kci))
     if "kMandarin" in char:
         km = char["kMandarin"]
         assert isinstance(km, dict)