diff --git a/gtsam/linear/HessianFactor-inl.h b/gtsam/linear/HessianFactor-inl.h
index 31a327bb8..4a21ab0ff 100644
--- a/gtsam/linear/HessianFactor-inl.h
+++ b/gtsam/linear/HessianFactor-inl.h
@@ -26,7 +26,7 @@ namespace gtsam {
     GaussianFactor(keys), info_(augmentedInformation)
   {
     // Check number of variables
-    if(Base::keys_.size() != augmentedInformation.nBlocks() - 1)
+    if((DenseIndex)Base::keys_.size() != augmentedInformation.nBlocks() - 1)
       throw std::invalid_argument(
       "Error in HessianFactor constructor input.  Number of provided keys plus\n"
       "one for the information vector must equal the number of provided matrix blocks.");
@@ -38,4 +38,4 @@ namespace gtsam {
       "must be the information vector, but the last provided block had more than one column.");
   }
 
-}
\ No newline at end of file
+}
diff --git a/gtsam/linear/HessianFactor.cpp b/gtsam/linear/HessianFactor.cpp
index d865bf589..f73b2b531 100644
--- a/gtsam/linear/HessianFactor.cpp
+++ b/gtsam/linear/HessianFactor.cpp
@@ -387,9 +387,9 @@ void HessianFactor::updateATA(const HessianFactor& update, const Scatter& scatte
   // Apply updates to the upper triangle
   gttic(update);
   for(DenseIndex j2=0; j2<update.info_.nBlocks(); ++j2) {
-    DenseIndex slot2 = (j2 == update.size()) ? this->info_.nBlocks()-1 : slots[j2];
+    DenseIndex slot2 = (j2 == (DenseIndex)update.size()) ? this->info_.nBlocks()-1 : slots[j2];
     for(DenseIndex j1=0; j1<=j2; ++j1) {
-      DenseIndex slot1 = (j1 == update.size()) ? this->info_.nBlocks()-1 : slots[j1];
+      DenseIndex slot1 = (j1 == (DenseIndex)update.size()) ? this->info_.nBlocks()-1 : slots[j1];
       if(slot2 > slot1)
         info_(slot1, slot2).noalias() += update.info_(j1, j2);
       else if(slot1 > slot2)
diff --git a/gtsam/linear/JacobianFactor-inl.h b/gtsam/linear/JacobianFactor-inl.h
index fb9582f24..d703cde9f 100644
--- a/gtsam/linear/JacobianFactor-inl.h
+++ b/gtsam/linear/JacobianFactor-inl.h
@@ -39,11 +39,11 @@ namespace gtsam {
   Base(keys), Ab_(augmentedMatrix)
   {
     // Check noise model dimension
-    if(model && model->dim() != augmentedMatrix.rows())
+    if(model && (DenseIndex)model->dim() != augmentedMatrix.rows())
       throw InvalidNoiseModel(augmentedMatrix.rows(), model->dim());
 
     // Check number of variables
-    if(Base::keys_.size() != augmentedMatrix.nBlocks() - 1)
+    if((DenseIndex)Base::keys_.size() != augmentedMatrix.nBlocks() - 1)
       throw std::invalid_argument(
       "Error in JacobianFactor constructor input.  Number of provided keys plus\n"
       "one for the RHS vector must equal the number of provided matrix blocks.");