diff --git a/shared/lib_pv_io_manager.cpp b/shared/lib_pv_io_manager.cpp
index e5bbe54be..367950d00 100644
--- a/shared/lib_pv_io_manager.cpp
+++ b/shared/lib_pv_io_manager.cpp
@@ -678,7 +678,12 @@ PVSystem_IO::PVSystem_IO(compute_module* cm, std::string cmName, Simulation_IO*
     }
 
     numberOfInverters = cm->as_integer("inverter_count");
-    numberOfInvertersClipping = cm->as_integer("num_inverter_subhourly_clipping");
+    if (cm->is_assigned("num_inverter_subhourly_clipping")) {
+        numberOfInvertersClipping = cm->as_integer("num_inverter_subhourly_clipping");
+    }
+    else {
+        numberOfInvertersClipping = 1;
+    }
 
     ratedACOutput = Inverter->ratedACOutput * numberOfInverters;
     acDerate = 1 - cm->as_double("acwiring_loss") / 100;