diff --git a/src/sage/modules/free_quadratic_module_integer_symmetric.py b/src/sage/modules/free_quadratic_module_integer_symmetric.py
index e1736a05c09..0a91bc0bb39 100644
--- a/src/sage/modules/free_quadratic_module_integer_symmetric.py
+++ b/src/sage/modules/free_quadratic_module_integer_symmetric.py
@@ -1559,14 +1559,10 @@ def _fplll_enumerate(self, target=None):
         """
         L = self.LLL()
         dim = L.dimension()
-        gram = L.gram_matrix()
         basis = L.basis_matrix()
 
         import fpylll
-        gmat = fpylll.IntegerMatrix(dim, dim)
-        for i in range(dim):
-            for j in range(dim):
-                gmat[i, j] = gram[i, j]
+        gmat = fpylll.IntegerMatrix.from_matrix(L.gram_matrix())
         gso = fpylll.GSO.Mat(gmat, gram=True)
         ok = gso.update_gso()
         assert ok