diff --git a/ArchiveExtractor/Core.py b/ArchiveExtractor/Core.py
index d36079794f7dcbdd52b80eafd114fb360f48f7f1..e193cf85359dc06e907cd697da42247c8ba89a2e 100644
--- a/ArchiveExtractor/Core.py
+++ b/ArchiveExtractor/Core.py
@@ -105,7 +105,7 @@ def _extract_scalar(attribute, method, date1, date2, db, dtype):
 
             # Transform to datetime - value arrays
             if dtype is bool:
-                _value = _cast_bool(_value)
+                _value = aea._cast_bool(_value)
             else:
                 _value = np.asarray(_value, dtype=dtype)