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diff --git a/UM/Qt/Bindings/i18nCatalogProxy.py b/UM/Qt/Bindings/i18nCatalogProxy.py
index 7e2bb16c..cec70dd6 100644
--- a/UM/Qt/Bindings/i18nCatalogProxy.py
+++ b/UM/Qt/Bindings/i18nCatalogProxy.py
@@ -86,9 +86,9 @@ class i18nCatalogProxy(QObject): # [CodeStyle: Ultimaker code style requires cla
# \todo Move this to a more generic place so more things can use it.
def _wrapFunction(self, engine, this_object, function):
# JavaScript code that wraps the Python method call in a closure
- wrap_js = """function(this_object) {{
+ wrap_js = """(function(this_object) {{
return function({args}) {{ return this_object.{function}({args}) }}
- }}"""
+ }})"""
# Get the function name and argument list.
function_name = function.__name__
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