diff --git a/examples/use_cases/use_case_41_bad_data.py b/examples/use_cases/use_case_41_bad_data.py
index 3c9300c1..1c9b262a 100644
--- a/examples/use_cases/use_case_41_bad_data.py
+++ b/examples/use_cases/use_case_41_bad_data.py
@@ -7,7 +7,7 @@
 import MulensModel as mm
 
 
-raise raise NotImplementedError(
+raise NotImplementedError(
     "We don't know how to enable this functionality.")
 
 data = mm.MulensData(file_name="my_data.dat")
@@ -22,4 +22,4 @@
 data.good[data.mag < 12.] = True
 data.plot(show_bad=True)
 
-plt.show()
\ No newline at end of file
+plt.show()