diff --git a/labscript_utils/unitconversions/__init__.py b/labscript_utils/unitconversions/__init__.py
index da49116..a1b01d3 100644
--- a/labscript_utils/unitconversions/__init__.py
+++ b/labscript_utils/unitconversions/__init__.py
@@ -26,7 +26,6 @@ class _All(object):
def __getitem__(self, ix):
if self.__all__ is None:
- self.__all__ = []
self._import_all()
return self.__all__[ix]
@@ -34,6 +33,8 @@ def _import_all(self):
"""imports all unit conversion classes in module within this subpackage into
this module's globals. This is used only for backward compatibility with unit
conversion classes that were not specified with a fully qualified name"""
+ if self.__all__ is None:
+ self.__all__ = []
for filename in os.listdir(os.path.split(__file__)[0]):
if filename.endswith('.py') and filename != '__init__.py':
module = filename[:-3]
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