diff --git a/python/lib/core/dmod/core/common/reader.py b/python/lib/core/dmod/core/common/reader.py
index a89ffb705..ea9deec52 100644
--- a/python/lib/core/dmod/core/common/reader.py
+++ b/python/lib/core/dmod/core/common/reader.py
@@ -14,7 +14,8 @@ def seek(self, offset: int, whence: int = SEEK_SET) -> int:
         """ Change the position to the given offset, returning the absolute position. """
 
 
-class ReadSeeker(Reader, Seeker):
+@runtime_checkable
+class ReadSeeker(Reader, Seeker, Protocol):
     """
     A :class:`Reader` capable of changing the position from which it is reading.
     """