diff --git a/mex/sources/bytecode/SparseMatrix.cc b/mex/sources/bytecode/SparseMatrix.cc
index 4214d1c67..07565b91f 100644
--- a/mex/sources/bytecode/SparseMatrix.cc
+++ b/mex/sources/bytecode/SparseMatrix.cc
@@ -1775,13 +1775,12 @@ mxArray *
 dynSparseMatrix::mult_SAT_B(const mxArray *A_m, const mxArray *B_m)
 {
   size_t n_A = mxGetN(A_m);
-  size_t m_A = mxGetM(A_m);
   mwIndex *A_i = mxGetIr(A_m);
   mwIndex *A_j = mxGetJc(A_m);
   double *A_d = mxGetPr(A_m);
   size_t n_B = mxGetN(B_m);
   double *B_d = mxGetPr(B_m);
-  mxArray *C_m = mxCreateDoubleMatrix(m_A, n_B, mxREAL);
+  mxArray *C_m = mxCreateDoubleMatrix(n_A, n_B, mxREAL);
   double *C_d = mxGetPr(C_m);
   for (int j = 0; j < static_cast<int>(n_B); j++)
     for (unsigned int i = 0; i < n_A; i++)
@@ -1802,14 +1801,13 @@ mxArray *
 dynSparseMatrix::Sparse_mult_SAT_B(const mxArray *A_m, const mxArray *B_m)
 {
   size_t n_A = mxGetN(A_m);
-  size_t m_A = mxGetM(A_m);
   mwIndex *A_i = mxGetIr(A_m);
   mwIndex *A_j = mxGetJc(A_m);
   double *A_d = mxGetPr(A_m);
   size_t n_B = mxGetN(B_m);
   size_t m_B = mxGetM(B_m);
   double *B_d = mxGetPr(B_m);
-  mxArray *C_m = mxCreateSparse(m_A, n_B, m_A*n_B, mxREAL);
+  mxArray *C_m = mxCreateSparse(n_A, n_B, n_A*n_B, mxREAL);
   mwIndex *C_i = mxGetIr(C_m);
   mwIndex *C_j = mxGetJc(C_m);
   double *C_d = mxGetPr(C_m);
@@ -1847,7 +1845,6 @@ mxArray *
 dynSparseMatrix::Sparse_mult_SAT_SB(const mxArray *A_m, const mxArray *B_m)
 {
   size_t n_A = mxGetN(A_m);
-  size_t m_A = mxGetM(A_m);
   mwIndex *A_i = mxGetIr(A_m);
   mwIndex *A_j = mxGetJc(A_m);
   double *A_d = mxGetPr(A_m);
@@ -1855,7 +1852,7 @@ dynSparseMatrix::Sparse_mult_SAT_SB(const mxArray *A_m, const mxArray *B_m)
   mwIndex *B_i = mxGetIr(B_m);
   mwIndex *B_j = mxGetJc(B_m);
   double *B_d = mxGetPr(B_m);
-  mxArray *C_m = mxCreateSparse(m_A, n_B, m_A*n_B, mxREAL);
+  mxArray *C_m = mxCreateSparse(n_A, n_B, n_A*n_B, mxREAL);
   mwIndex *C_i = mxGetIr(C_m);
   mwIndex *C_j = mxGetJc(C_m);
   double *C_d = mxGetPr(C_m);