diff --git a/opm/simulators/flow/ReservoirCouplingMaster.cpp b/opm/simulators/flow/ReservoirCouplingMaster.cpp
index c0e82fe327..f8b13af42a 100644
--- a/opm/simulators/flow/ReservoirCouplingMaster.cpp
+++ b/opm/simulators/flow/ReservoirCouplingMaster.cpp
@@ -68,7 +68,7 @@ maybeSpawnSlaveProcesses(int report_step)
     auto slave_count = rescoup.slaveCount();
     auto master_group_count = rescoup.masterGroupCount();
     if (slave_count > 0 && master_group_count > 0) {
-        ReservoirCouplingSpawnSlaves spawn_slaves{*this, rescoup, report_step};
+        ReservoirCouplingSpawnSlaves spawn_slaves{*this, rescoup};
         spawn_slaves.spawn();
     }
 }
diff --git a/opm/simulators/flow/ReservoirCouplingSpawnSlaves.cpp b/opm/simulators/flow/ReservoirCouplingSpawnSlaves.cpp
index 741bbb224a..93d4f14717 100644
--- a/opm/simulators/flow/ReservoirCouplingSpawnSlaves.cpp
+++ b/opm/simulators/flow/ReservoirCouplingSpawnSlaves.cpp
@@ -46,12 +46,10 @@ namespace Opm {
 ReservoirCouplingSpawnSlaves::
 ReservoirCouplingSpawnSlaves(
     ReservoirCouplingMaster &master,
-    const ReservoirCoupling::CouplingInfo &rescoup,
-    const int report_step
+    const ReservoirCoupling::CouplingInfo &rescoup
 ) :
     master_{master},
     rescoup_{rescoup},
-    report_step_{report_step},
     comm_{master.getComm()}
 {
 }
diff --git a/opm/simulators/flow/ReservoirCouplingSpawnSlaves.hpp b/opm/simulators/flow/ReservoirCouplingSpawnSlaves.hpp
index 054f9939b2..bbccbff22e 100644
--- a/opm/simulators/flow/ReservoirCouplingSpawnSlaves.hpp
+++ b/opm/simulators/flow/ReservoirCouplingSpawnSlaves.hpp
@@ -41,8 +41,7 @@ public:
 
     ReservoirCouplingSpawnSlaves(
         ReservoirCouplingMaster &master,
-        const ReservoirCoupling::CouplingInfo &rescoup,
-        const int report_step
+        const ReservoirCoupling::CouplingInfo &rescoup
     );
 
     void spawn();
@@ -64,7 +63,6 @@ private:
 
     ReservoirCouplingMaster &master_;
     const ReservoirCoupling::CouplingInfo &rescoup_;
-    const int report_step_;
     const Parallel::Communication &comm_;
 };