diff --git a/PICMI_Python/particles.py b/PICMI_Python/particles.py
index 0b3a7fb..027529f 100644
--- a/PICMI_Python/particles.py
+++ b/PICMI_Python/particles.py
@@ -349,7 +349,7 @@ def __init__(self,
         self.front = front
         self.thickness = thickness
         self.exponential_pre_plasma_length = exponential_pre_plasma_length
-        self.exponential_pre_plasma_cutoff = exponential_pre_plasma_cutof
+        self.exponential_pre_plasma_cutoff = exponential_pre_plasma_cutoff
         self.exponential_post_plasma_length = exponential_post_plasma_length
         self.exponential_post_plasma_cutoff = exponential_post_plasma_cutoff