diff --git a/plugins/inputs/procstat/filter.go b/plugins/inputs/procstat/filter.go
index 9efe37f44..3c090549c 100644
--- a/plugins/inputs/procstat/filter.go
+++ b/plugins/inputs/procstat/filter.go
@@ -107,7 +107,7 @@ func (f *Filter) ApplyFilter() ([]processGroup, error) {
 		}
 		groups = append(groups, g...)
 	case len(f.SystemdUnits) > 0:
-		g, err := findBySystemdUnits(f.CGroups)
+		g, err := findBySystemdUnits(f.SystemdUnits)
 		if err != nil {
 			return nil, err
 		}