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-rw-r--r--gerbonara/apertures.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/gerbonara/apertures.py b/gerbonara/apertures.py
index b411412..d5670a2 100644
--- a/gerbonara/apertures.py
+++ b/gerbonara/apertures.py
@@ -474,7 +474,7 @@ class ApertureMacroInstance(Aperture):
macro : object
#: The parameters to the :py:class:`.ApertureMacro`. All elements should be floats or ints. The first item in the
#: list is parameter ``$1``, the second is ``$2`` etc.
- parameters : list
+ parameters : list = field(default_factory=list)
#: Aperture rotation in radians. When saving, a copy of the :py:class:`.ApertureMacro` is re-written with this
#: rotation.
rotation : float = 0