diff --git a/gtsam/nonlinear/ISAM2-impl.cpp b/gtsam/nonlinear/ISAM2-impl.cpp
index 9abd62016..ffdbd6d10 100644
--- a/gtsam/nonlinear/ISAM2-impl.cpp
+++ b/gtsam/nonlinear/ISAM2-impl.cpp
@@ -116,7 +116,10 @@ void ISAM2::Impl::RemoveVariables(const FastSet<Key>& unusedKeys, const ISAM2Cli
      // Reorder and remove from ordering, solution, and fixed keys
      ordering.permuteInPlace(unusedToEnd);
      BOOST_REVERSE_FOREACH(Key key, unusedKeys) {
-       Ordering::value_type removed = ordering.pop_back();
+#ifndef NDEBUG
+       Ordering::value_type removed =
+#endif
+           ordering.pop_back();
        assert(removed.first == key);
        theta.erase(key);
        fixedVariables.erase(key);
diff --git a/gtsam_unstable/nonlinear/ConcurrentBatchSmoother.cpp b/gtsam_unstable/nonlinear/ConcurrentBatchSmoother.cpp
index d9c59d0ea..bc3e591f9 100644
--- a/gtsam_unstable/nonlinear/ConcurrentBatchSmoother.cpp
+++ b/gtsam_unstable/nonlinear/ConcurrentBatchSmoother.cpp
@@ -266,7 +266,6 @@ ConcurrentBatchSmoother::Result ConcurrentBatchSmoother::optimize() {
   result.linearVariables = separatorValues_.size();
 
   // Pull out parameters we'll use
-  const NonlinearOptimizerParams::Verbosity nloVerbosity = parameters_.verbosity;
   const LevenbergMarquardtParams::VerbosityLM lmVerbosity = parameters_.verbosityLM;
   double lambda = parameters_.lambdaInitial;