diff --git a/src/boundary_conditions.jl b/src/boundary_conditions.jl
index bb9172bd4..1480af1a3 100644
--- a/src/boundary_conditions.jl
+++ b/src/boundary_conditions.jl
@@ -528,6 +528,7 @@ apply_bc_temp!(bc::PressureBC, temp, β, t, setup; isright, kwargs...) =
 apply_bc_temp_pullback!(bc::PressureBC, φbar, β, t, setup; isright, kwargs...) =
     apply_bc_p_pullback!(SymmetricBC(), φbar, β, t, setup; isright, kwargs...)
 
+# COV_EXCL_START
 # Wrap a function to return `nothing`, because Enzyme can not handle vector return values.
 function enzyme_wrap(
     f::Union{typeof(apply_bc_u!),typeof(apply_bc_p!),typeof(apply_bc_temp!)},
@@ -602,3 +603,4 @@ function EnzymeRules.reverse(
     y.dval .= x.dval # y is a copy of x
     return (nothing, nothing, nothing, nothing)
 end
+# COV_EXCL_STOP
diff --git a/src/operators.jl b/src/operators.jl
index 1a9a1c5a8..c436d274f 100644
--- a/src/operators.jl
+++ b/src/operators.jl
@@ -1465,6 +1465,7 @@ function get_scale_numbers(u, setup)
     (; uavg, ϵ, η, λ, Reλ, L, τ)
 end
 
+# COV_EXCL_START
 # Wrap a function to return `nothing`, because Enzyme can not handle vector return values.
 function enzyme_wrap(
     f::Union{
@@ -1753,3 +1754,4 @@ function EnzymeRules.reverse(
 )
     @error "momentum Enzyme-AD not yet implemented"
 end
+# COV_EXCL_STOP
diff --git a/src/pressure.jl b/src/pressure.jl
index 3523057a8..7405bbd8c 100644
--- a/src/pressure.jl
+++ b/src/pressure.jl
@@ -358,6 +358,7 @@ function psolver_spectral(setup)
     end
 end
 
+# COV_EXCL_START
 # Wrap a function to return `nothing`, because Enzyme can not handle vector return values.
 function enzyme_wrap(f::typeof(poisson!))
     function wrapped_f(p, psolve, d)
@@ -393,3 +394,4 @@ function EnzymeRules.reverse(
     EnzymeCore.make_zero!(y.dval)
     return (nothing, nothing, nothing)
 end
+# COV_EXCL_STOP
diff --git a/src/sciml.jl b/src/sciml.jl
index f7c1ad13b..becb909a1 100644
--- a/src/sciml.jl
+++ b/src/sciml.jl
@@ -46,6 +46,7 @@ function right_hand_side!(dudt, u, params_ref, t)
     return nothing
 end
 
+# COV_EXCL_START
 function EnzymeRules.augmented_primal(
     config::RevConfigWidth{1},
     func::Const{typeof(right_hand_side!)},
@@ -109,3 +110,4 @@ function EnzymeRules.reverse(
 
     return (nothing, nothing, nothing, nothing)
 end
+# COV_EXCL_STOP