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[ginac.git] / ginac / tensor.cpp

diff --git a/ginac/tensor.cpp b/ginac/tensor.cpp
index f786c4a193963524ca84483880fe42670b1a515e..48393665ad5fc0555add8a19bba463af14abf288 100644 (file)
--- a/ginac/tensor.cpp
+++ b/ginac/tensor.cpp
@@ -501,8 +501,8 @@ bool tensepsilon::contract_with(exvector::iterator self, exvector::iterator othe
                // Contraction of two epsilon tensors is a determinant
                bool variance = is_a<varidx>(self->op(1));
                matrix M(num, num);
-               for (int i=0; i<num; i++) {
-                       for (int j=0; j<num; j++) {
+               for (unsigned i=0; i<num; i++) {
+                       for (unsigned j=0; j<num; j++) {
                                if (minkowski)
                                        M(i, j) = lorentz_g(self->op(i+1), other->op(j+1), pos_sig);
                                else if (variance)