diff --git a/src/dd4pod/python/npsim/DDSim/Helper/Gun.py b/src/dd4pod/python/npsim/DDSim/Helper/Gun.py
index 9fdde03b5396aea45891727f6d2ba06a0e7f5869..ab1f58a8209858db275405b617faec3db9baf1f3 100644
--- a/src/dd4pod/python/npsim/DDSim/Helper/Gun.py
+++ b/src/dd4pod/python/npsim/DDSim/Helper/Gun.py
@@ -122,9 +122,13 @@ class Gun(ConfigHelper):
       ddg4Gun.direction = self.direction
       ddg4Gun.Distribution = self.distribution
       if self.etaMin is not None:
-        self.thetaMin = str(2.0*atan(exp(-float(self.etaMin)))/deg)
+        self.thetaMax = str(2.0*atan(exp(-float(self.etaMin))))
+        ddg4Gun.ThetaMax = str(2.0*atan(exp(-float(self.etaMin))))
+        ddg4Gun.isotrop = True
       if self.etaMax is not None:
-        self.thetaMax = str(2.0*atan(exp(-float(self.etaMax)))/deg)
+        self.thetaMin = str(2.0*atan(exp(-float(self.etaMax))))
+        ddg4Gun.ThetaMin = str(2.0*atan(exp(-float(self.etaMax))))
+        ddg4Gun.isotrop = True
       if self.thetaMin is not None:
         ddg4Gun.ThetaMin = self.thetaMin
         ddg4Gun.isotrop = True