diff --git a/aequilibrae/matrix/aequilibrae_matrix.py b/aequilibrae/matrix/aequilibrae_matrix.py
index d11401444..26e8660f0 100644
--- a/aequilibrae/matrix/aequilibrae_matrix.py
+++ b/aequilibrae/matrix/aequilibrae_matrix.py
@@ -784,7 +784,7 @@ def export(self, output_name: str, cores: List[str] = None):
 
             def f(name):
                 if self.__omx:
-                    coo = np.array(self.omx_file[name])
+                    coo = coo_matrix(np.array(self.omx_file[name]))
                 else:
                     coo = coo_matrix(self.matrix[name])
                 data = {"row": self.index[coo.row], "column": self.index[coo.col], name: coo.data}