diff --git a/sensorium/adapters/text.py b/sensorium/adapters/text.py
index 53bbc45a..2ce34706 100644
--- a/sensorium/adapters/text.py
+++ b/sensorium/adapters/text.py
@@ -50,7 +50,11 @@ class TextProjectionHead:
     modality:      Modality = Modality.TEXT
     embedding_dim: int      = CL41_DIM
 
-    def __init__(self, vocabulary: ModalityVocabulary, oov_policy: OOVPolicy) -> None:
+    def __init__(
+        self,
+        vocabulary: ModalityVocabulary,
+        oov_policy: OOVPolicy = OOVPolicy.TAGGED_FALLBACK,
+    ) -> None:
         self._vocab = vocabulary
         self._oov_policy = oov_policy