diff --git a/src/modify.cpp b/src/modify.cpp
index 4fd20bc74b..aa2b0cccc6 100644
--- a/src/modify.cpp
+++ b/src/modify.cpp
@@ -1447,7 +1447,7 @@ void Modify::addstep_compute(bigint newstep)
   }
 
   for (int icompute = 0; icompute < n_timeflag; icompute++)
-    if (compute[list_timeflag[icompute]]->invoked_flag)
+    if (compute[list_timeflag[icompute]]->invoked_flag >=0)
       compute[list_timeflag[icompute]]->addstep(newstep);
 }