diff --git a/src/EXTRA-FIX/fix_oneway.cpp b/src/EXTRA-FIX/fix_oneway.cpp
index d514a081f1..f31781d936 100644
--- a/src/EXTRA-FIX/fix_oneway.cpp
+++ b/src/EXTRA-FIX/fix_oneway.cpp
@@ -35,6 +35,7 @@ FixOneWay::FixOneWay(LAMMPS *lmp, int narg, char **arg) :
     Fix(lmp, narg, arg), region(nullptr), idregion(nullptr)
 {
   direction = NONE;
+  dynamic_group_allow = 1;
 
   if (narg < 6) error->all(FLERR, "Illegal fix oneway command");