diff --git a/gusto/equations/boussinesq_equations.py b/gusto/equations/boussinesq_equations.py
index dc6977bc6..0711259e1 100644
--- a/gusto/equations/boussinesq_equations.py
+++ b/gusto/equations/boussinesq_equations.py
@@ -225,7 +225,6 @@ class LinearBoussinesqEquations(BoussinesqEquations):
 
     def __init__(self, domain, parameters,
                  compressible=True,
-                 Omega=None,
                  space_names=None,
                  linearisation_map='default',
                  u_transport_option="vector_invariant_form",
@@ -239,8 +238,6 @@ def __init__(self, domain, parameters,
                 the model's physical parameters.
             compressible (bool, optional): flag to indicate whether the
                 equations are compressible. Defaults to True
-            Omega (:class:`ufl.Expr`, optional): an expression for the planet's
-                rotation vector. Defaults to None.
             space_names (dict, optional): a dictionary of strings for names of
                 the function spaces to use for the spatial discretisation. The
                 keys are the names of the prognostic variables. Defaults to None
@@ -276,7 +273,6 @@ def __init__(self, domain, parameters,
         super().__init__(domain=domain,
                          parameters=parameters,
                          compressible=compressible,
-                         Omega=Omega,
                          space_names=space_names,
                          linearisation_map=linearisation_map,
                          u_transport_option=u_transport_option,
diff --git a/gusto/equations/compressible_euler_equations.py b/gusto/equations/compressible_euler_equations.py
index 5ba2874ba..73b80b7d6 100644
--- a/gusto/equations/compressible_euler_equations.py
+++ b/gusto/equations/compressible_euler_equations.py
@@ -279,7 +279,7 @@ class HydrostaticCompressibleEulerEquations(CompressibleEulerEquations):
     equations.
     """
 
-    def __init__(self, domain, parameters, Omega=None, sponge=None,
+    def __init__(self, domain, parameters, sponge=None,
                  extra_terms=None, space_names=None, linearisation_map='default',
                  u_transport_option="vector_invariant_form",
                  diffusion_options=None,
@@ -291,8 +291,6 @@ def __init__(self, domain, parameters, Omega=None, sponge=None,
                 mesh and the compatible function spaces.
             parameters (:class:`Configuration`, optional): an object containing
                 the model's physical parameters.
-            Omega (:class:`ufl.Expr`, optional): an expression for the planet's
-                rotation vector. Defaults to None.
             sponge (:class:`ufl.Expr`, optional): an expression for a sponge
                 layer. Defaults to None.
             extra_terms (:class:`ufl.Expr`, optional): any extra terms to be
@@ -325,7 +323,7 @@ def __init__(self, domain, parameters, Omega=None, sponge=None,
             NotImplementedError: only mixing ratio tracers are implemented.
         """
 
-        super().__init__(domain, parameters, Omega=Omega, sponge=sponge,
+        super().__init__(domain, parameters, sponge=sponge,
                          extra_terms=extra_terms, space_names=space_names,
                          linearisation_map=linearisation_map,
                          u_transport_option=u_transport_option,