diff --git a/olca/ipc.py b/olca/ipc.py
index ffc5e6d..014bfc0 100644
--- a/olca/ipc.py
+++ b/olca/ipc.py
@@ -65,7 +65,7 @@ def next_simulation(self, simulator: schema.Ref) -> schema.SimpleResult:
         """
         if simulator is None:
             raise ValueError('No simulator given')
-        resp = self.__post('calculate', simulator.to_json())
+        resp = self.__post('next/simulation', simulator.to_json())
         result = schema.SimpleResult()
         result.from_json(resp)
         return result