diff --git a/gtsam/base/cholesky.cpp b/gtsam/base/cholesky.cpp
index 31e4b8244..17cb291f0 100644
--- a/gtsam/base/cholesky.cpp
+++ b/gtsam/base/cholesky.cpp
@@ -111,7 +111,7 @@ bool choleskyPartial(Matrix& ABC, size_t nFrontal, size_t topleft) {
     return true;
 
   assert(ABC.cols() == ABC.rows());
-  assert(ABC.rows() >= topleft);
+  assert(size_t(ABC.rows()) >= topleft);
   const size_t n = static_cast<size_t>(ABC.rows() - topleft);
   assert(nFrontal <= size_t(n));
 
diff --git a/gtsam/linear/HessianFactor.cpp b/gtsam/linear/HessianFactor.cpp
index d16373c78..c208259b8 100644
--- a/gtsam/linear/HessianFactor.cpp
+++ b/gtsam/linear/HessianFactor.cpp
@@ -505,7 +505,7 @@ VectorValues HessianFactor::solve() {
 
   // Do Cholesky Factorization
   const size_t n = size();
-  assert(info_.nBlocks() == n + 1);
+  assert(size_t(info_.nBlocks()) == n + 1);
   info_.choleskyPartial(n);
   auto R = info_.triangularView(0, n);
   auto eta = linearTerm();