diff --git a/mex/sources/estimation/libmat/Matrix.hh b/mex/sources/estimation/libmat/Matrix.hh
index 18f1776fc..b2ffdb20f 100644
--- a/mex/sources/estimation/libmat/Matrix.hh
+++ b/mex/sources/estimation/libmat/Matrix.hh
@@ -519,7 +519,7 @@ namespace mat
   reorderColumnsByVectors(Mat1 &a, const std::vector<size_t> &vToCols,
                           const Mat2 &b, const std::vector<size_t> &vcols)
   {
-    size_t nrows = a.getRows(), ncols = 0, toncols = 0;
+    size_t ncols = 0, toncols = 0;
     const std::vector<size_t> *vpToCols = 0, *vpCols = 0;
     std::vector<size_t> tmpvpToCols(0), tmpvpCols(0);
     assert(b.getRows() ==  a.getRows());
@@ -579,7 +579,7 @@ namespace mat
   reorderRowsByVectors(Mat1 &a, const std::vector<size_t> &vToRows,
                        const Mat2 &b, const std::vector<size_t> &vrows)
   {
-    size_t nrows = 0, tonrows = 0, ncols = a.getCols();
+    size_t nrows = 0, tonrows = 0;
     const std::vector<size_t>  *vpToRows = 0, *vpRows = 0;
     std::vector<size_t>  tmpvpToRows(0), tmpvpRows(0);
 
diff --git a/mex/sources/estimation/libmat/tests/test-repmat.cc b/mex/sources/estimation/libmat/tests/test-repmat.cc
index 3ce97c82d..f8581eea3 100644
--- a/mex/sources/estimation/libmat/tests/test-repmat.cc
+++ b/mex/sources/estimation/libmat/tests/test-repmat.cc
@@ -34,10 +34,10 @@ main(int argc, char **argv)
 
   Matrix   S1(m, 2 *n), S2(2*m, n);
   std::vector<size_t>  toC(n), toR(m);
-  for (int i = 0; i < n; i++)
+  for (size_t i = 0; i < n; i++)
     toC[i] = 2*i;
 
-  for (int j = 0; j < m; j++)
+  for (size_t j = 0; j < m; j++)
     toR[j] = m-j-1;
 
   mat::assignByVectors(S1, mat::nullVec, toC, S, mat::nullVec, mat::nullVec);