diff --git a/mapytex/calculus/core/compute/arithmetic.py b/mapytex/calculus/core/arithmetic.py
similarity index 100%
rename from mapytex/calculus/core/compute/arithmetic.py
rename to mapytex/calculus/core/arithmetic.py
diff --git a/mapytex/calculus/core/compute/add.py b/mapytex/calculus/core/compute/add.py
index 703bbc7..9569ddc 100644
--- a/mapytex/calculus/core/compute/add.py
+++ b/mapytex/calculus/core/compute/add.py
@@ -16,7 +16,7 @@ from ..MO import MO, MOnumber, MOstr
 from ..MO.fraction import MOFraction
 from ..MO.monomial import MOstrPower, MOMonomial
 from ..MO.polynomial import MOpolynomial
-from .arithmetic import lcm
+from ..arithmetic import lcm
 from .filters import special_case
 
 add_doc = """ Adding MOs