diff --git a/klamath/records.py b/klamath/records.py
index d5ac938..b05bb04 100644
--- a/klamath/records.py
+++ b/klamath/records.py
@@ -173,6 +173,8 @@ class GENERATIONS(Int2Record):
 
     @classmethod
     def check_data(cls: type[Self], data: NDArray[numpy.integer] | Sequence[int] | int) -> None:
+        if isinstance(data, (int, numpy.integer)):
+            return
         if not isinstance(data, Sized) or len(data) != 1:
             raise KlamathError(f'Expected exactly one integer, got {data}')
 
@@ -270,6 +272,8 @@ class FORMAT(Int2Record):
 
     @classmethod
     def check_data(cls: type[Self], data: NDArray[numpy.integer] | Sequence[int] | int) -> None:
+        if isinstance(data, (int, numpy.integer)):
+            return
         if not isinstance(data, Sized) or len(data) != 1:
             raise KlamathError(f'Expected exactly one integer, got {data}')