diff --git a/pyerrors/linalg.py b/pyerrors/linalg.py
index afdcb18a..3b1950eb 100644
--- a/pyerrors/linalg.py
+++ b/pyerrors/linalg.py
@@ -203,7 +203,12 @@ def cholesky(x):
     return _mat_mat_op(anp.linalg.cholesky, x)
 
 
-def scalar_mat_op(op, obs, **kwargs):
+def det(x):
+    """Determinant of Obs valued matrices."""
+    return _scalar_mat_op(anp.linalg.det, x)
+
+
+def _scalar_mat_op(op, obs, **kwargs):
     """Computes the matrix to scalar operation op to a given matrix of Obs."""
     def _mat(x, **kwargs):
         dim = int(np.sqrt(len(x)))
diff --git a/tests/linalg_test.py b/tests/linalg_test.py
index bc45a8f0..f446d972 100644
--- a/tests/linalg_test.py
+++ b/tests/linalg_test.py
@@ -311,6 +311,9 @@ def test_matrix_functions():
     for (i, j), entry in np.ndenumerate(diff):
         assert entry.is_zero()
 
+    # Check determinant
+    assert pe.linalg.det(np.diag(np.diag(matrix))) == np.prod(np.diag(matrix))
+
 
 def test_complex_matrix_operations():
     dimension = 4