diff --git a/tivars/flash.py b/tivars/flash.py
index 340d68b..f86146b 100644
--- a/tivars/flash.py
+++ b/tivars/flash.py
@@ -790,5 +790,9 @@ def coerce(self):
                 warn(f"Type ID 0x{self.type_id:02x} is not recognized; header will not be coerced to a subclass.",
                      BytesWarning)
 
+            else:
+                warn("Type ID is 0xFF, no coercion will occur.",
+                     UserWarning)
+
 
 __all__ = ["DeviceType", "BCDDate", "BCDRevision", "TIFlashBlock", "TIFlashHeader"]
diff --git a/tivars/var.py b/tivars/var.py
index b42dd99..4315ca4 100644
--- a/tivars/var.py
+++ b/tivars/var.py
@@ -867,6 +867,10 @@ def coerce(self):
                 warn(f"Type ID 0x{self.type_id:02x} is not recognized; entry will not be coerced to a subclass.",
                      BytesWarning)
 
+            else:
+                warn("Type ID is 0xFF, no coercion will occur.",
+                     UserWarning)
+
 
 class TIVar:
     """