diff --git a/tests/test_identifiability_constraints.py b/tests/test_identifiability_constraints.py
index 3320faf7..f40ad214 100644
--- a/tests/test_identifiability_constraints.py
+++ b/tests/test_identifiability_constraints.py
@@ -190,7 +190,7 @@ def test_feature_matrix_dtype(dtype, expected_dtype):
 )
 def test_apply_constraint_with_invalid(invalid_entries):
     """Test if the matrix retains its dtype after applying constraints."""
-    jax.config.update('jax_enable_x64', True)
+    jax.config.update("jax_enable_x64", True)
     x = np.random.randn(10, 5)
     # add invalid
     x[:2, 2] = invalid_entries