diff --git a/gtsam/inference/GenericSequentialSolver-inl.h b/gtsam/inference/GenericSequentialSolver-inl.h
index 5382bc494..8b7d386fe 100644
--- a/gtsam/inference/GenericSequentialSolver-inl.h
+++ b/gtsam/inference/GenericSequentialSolver-inl.h
@@ -144,7 +144,7 @@ namespace gtsam {
     size_t nrToEliminate = nrMarginalized + nrFrontals;
     sharedBayesNet bayesNet = eliminate(*permutation, function, nrToEliminate);
     // Get rid of conditionals on variables that we want to marginalize out
-    for (int i = 0; i < nrMarginalized; i++)
+    for (size_t i = 0; i < nrMarginalized; i++)
       bayesNet->pop_front();
 
     return bayesNet;