diff --git a/gtsam_unstable/nonlinear/ConcurrentBatchFilter.cpp b/gtsam_unstable/nonlinear/ConcurrentBatchFilter.cpp
index 4c8e68bbe..9e7393c13 100644
--- a/gtsam_unstable/nonlinear/ConcurrentBatchFilter.cpp
+++ b/gtsam_unstable/nonlinear/ConcurrentBatchFilter.cpp
@@ -42,7 +42,6 @@ bool ConcurrentBatchFilter::equals(const ConcurrentFilter& rhs, double tol) cons
       && theta_.equals(filter->theta_)
       && ordering_.equals(filter->ordering_)
       && delta_.equals(filter->delta_)
-      && variableIndex_.equals(filter->variableIndex_)
       && separatorValues_.equals(filter->separatorValues_);
 }