diff --git a/src/outputs/parthenon_opmd.cpp b/src/outputs/parthenon_opmd.cpp
index c0ee2aa434b2..f4c892e4145e 100644
--- a/src/outputs/parthenon_opmd.cpp
+++ b/src/outputs/parthenon_opmd.cpp
@@ -663,9 +663,15 @@ void OpenPMDOutput::WriteOutputFile(Mesh *pm, ParameterInput *pin, SimTime *tm,
   // advance output parameters if this is not a triggered (now or final) output
   if (signal == SignalHandler::OutputSignal::none) {
     output_params.file_number++;
-    output_params.next_time += output_params.dt;
     pin->SetInteger(output_params.block_name, "file_number", output_params.file_number);
-    pin->SetReal(output_params.block_name, "next_time", output_params.next_time);
+    if (output_params.dt > 0.0) {
+      output_params.next_time += output_params.dt;
+      pin->SetReal(output_params.block_name, "next_time", output_params.next_time);
+    }
+    if (output_params.dn > 0) {
+      output_params.next_n += output_params.dn;
+      pin->SetInteger(output_params.block_name, "next_n", output_params.next_n);
+    }
   }
 }