diff --git a/gtsam_unstable/nonlinear/Expression.h b/gtsam_unstable/nonlinear/Expression.h
index bcda7c331..ea2e6280d 100644
--- a/gtsam_unstable/nonlinear/Expression.h
+++ b/gtsam_unstable/nonlinear/Expression.h
@@ -126,7 +126,7 @@ public:
 
   /// Return value and derivatives, reverse AD version
   Augmented<T> reverse(const Values& values) const {
-    char raw[10];
+    char raw[352];
     ExecutionTrace<T> trace;
     T value(root_->traceExecution(values, trace, raw));
     Augmented<T> augmented(value);
diff --git a/gtsam_unstable/nonlinear/tests/testExpressionFactor.cpp b/gtsam_unstable/nonlinear/tests/testExpressionFactor.cpp
index 5a3128d56..f64f2a11a 100644
--- a/gtsam_unstable/nonlinear/tests/testExpressionFactor.cpp
+++ b/gtsam_unstable/nonlinear/tests/testExpressionFactor.cpp
@@ -191,7 +191,7 @@ TEST(ExpressionFactor, shallow) {
   char raw[size];
   ExecutionTrace<Point2> trace;
   Point2 value = expression.traceExecution(values, trace, raw);
-  trace.print();
+  // trace.print();
 
   // Expected Jacobians
   Matrix23 expected23;