diff --git a/deepspeech/frontend/utility.py b/deepspeech/frontend/utility.py
index 4ea8bf1b..3a972b50 100644
--- a/deepspeech/frontend/utility.py
+++ b/deepspeech/frontend/utility.py
@@ -28,7 +28,7 @@ logger = Log(__name__).getlog()
 __all__ = [
     "load_dict", "load_cmvn", "read_manifest", "rms_to_db", "rms_to_dbfs",
     "max_dbfs", "mean_dbfs", "gain_db_to_ratio", "normalize_audio", "SOS",
-    "EOS", "UNK", "BLANK", "MASKCTC"
+    "EOS", "UNK", "BLANK", "MASKCTC", "SPACE"
 ]
 
 IGNORE_ID = -1