diff --git a/Python/main.py b/Python/main.py
index 7d129b7..5e2dca6 100755
--- a/Python/main.py
+++ b/Python/main.py
@@ -2563,7 +2563,7 @@ def PeakSelector(self, mod):
     def ratio_setup(self, pars, index_pk, strind, index):
         if index == 2 or index == 6:  # unset default expression which sets sigma and gamma for the voigt and skewed-voigt always to the same value
             pars[strind + str(index_pk + 1) + '_gamma'].expr = ''
-            pars[strind + str(index_pk + 1) + '_gamma'].vary = True
+            if not self.pre[2][3][2 * index_pk] == 2: pars[strind + str(index_pk + 1) + '_gamma'].vary = True
         # amp ratio setup
         if self.pre[2][15][2 * index_pk + 1] > 0:
             pktar = self.pre[2][15][2 * index_pk + 1]