diff --git a/pandas/core/arrays/period.py b/pandas/core/arrays/period.py
index 457419cacf9e7..5f267a9f816e7 100644
--- a/pandas/core/arrays/period.py
+++ b/pandas/core/arrays/period.py
@@ -370,10 +370,15 @@ def _unbox_scalar(  # type: ignore[override]
     def _scalar_from_string(self, value: str) -> Period:
         return Period(value, freq=self.freq)
 
-    def _check_compatible_with(self, other: Period | NaTType | PeriodArray) -> None:
+    # error: Argument 1 of "_check_compatible_with" is incompatible with
+    # supertype "DatetimeLikeArrayMixin"; supertype defines the argument type
+    # as "Period | Timestamp | Timedelta | NaTType"
+    def _check_compatible_with(self, other: Period | NaTType | PeriodArray) -> None:  # type: ignore[override]
         if other is NaT:
             return
-        self._require_matching_freq(other.freq)
+        # error: Item "NaTType" of "Period | NaTType | PeriodArray" has no
+        # attribute "freq"
+        self._require_matching_freq(other.freq)  # type: ignore[union-attr]
 
     # --------------------------------------------------------------------
     # Data / Attributes