diff --git a/src/chromo/common.py b/src/chromo/common.py
index fde92a0e..ee0f1522 100644
--- a/src/chromo/common.py
+++ b/src/chromo/common.py
@@ -810,7 +810,7 @@ def cross_section(self, kin=None, max_info=False):
                     kin3.p2 = component
                     # this calls cross_section recursively, which is fine
                     cross_section._mul_radd(
-                        fraction, self._cross_section(kin3, max_info=max_info)
+                        fraction, self.cross_section(kin3, max_info=max_info)
                     )
                 return cross_section
             return self._cross_section(kin, max_info=max_info)
@@ -1010,6 +1010,10 @@ def _temporary_kinematics(self, kin):
             yield
         else:
             prev = copy.copy(self.kinematics)
-            self.kinematics = kin
+            self._check_kinematics(kin)
+            self._kinematics = kin
+            self._set_kinematics(kin)
             yield
-            self.kinematics = prev
+            # _check_kinematics not necessary because it's the old kinematics
+            self._kinematics = prev
+            self._set_kinematics(prev)