diff --git a/SL_orbit.jl b/SL_orbit.jl
index b5f234f..bc62a69 100644
--- a/SL_orbit.jl
+++ b/SL_orbit.jl
@@ -28,8 +28,7 @@ end
 function (p::perm)(A::MatElem)
     length(p.d) == A.r == A.c || throw("Can't act via $p on matrix of size ($(A.r), $(A.c))")
     R = parent(A)
-    inv_p = inv(p)
-    return R(Nemo.matrix_repr(p))*A*R(Nemo.matrix_repr(inv_p))
+    return p*A*inv(p)
 end
 
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