diff --git a/src/identifiable_functions.jl b/src/identifiable_functions.jl
index ce5415db5..02079564b 100644
--- a/src/identifiable_functions.jl
+++ b/src/identifiable_functions.jl
@@ -125,7 +125,7 @@ function _find_identifiable_functions(
             priority_variables = [parent_ring_change(p, bring) for p in ode.parameters],
         )
     else
-        id_funcs_fracs = dennums_to_fractions(id_funcs)
+        id_funcs_fracs = RationalFunctionFields.dennums_to_fractions(id_funcs)
     end
     id_funcs_fracs = [parent_ring_change(f, parent(ode)) for f in id_funcs_fracs]
     _runtime_logger[:id_total] = (time_ns() - runtime_start) / 1.0e9
diff --git a/src/known_ic.jl b/src/known_ic.jl
index a4b7d9bb7..83f359bce 100644
--- a/src/known_ic.jl
+++ b/src/known_ic.jl
@@ -42,20 +42,22 @@ function _find_identifiable_functions_kic(
         ode,
         prob_threshold = half_p,
         with_states = true,
-        simplify = simplify,
+        simplify = :absent,
         rational_interpolator = rational_interpolator,
         seed = seed,
     )
 
-    id_funcs = simplified_generating_set(
-        RationalFunctionField(
-            vcat(id_funcs_general, [f // one(parent(ode)) for f in known_ic]),
-        ),
-        prob_threshold = half_p,
-        seed = seed,
-        simplify = simplify,
-        rational_interpolator = rational_interpolator,
-    )
+    id_funcs = vcat(id_funcs_general, [f // one(parent(ode)) for f in known_ic])
+
+    if (simplify != :absent)
+        id_funcs = simplified_generating_set(
+            RationalFunctionField(id_funcs),
+            prob_threshold = half_p,
+            seed = seed,
+            simplify = simplify,
+            rational_interpolator = rational_interpolator,
+        )
+    end
 
     @info "The search for identifiable functions with known initial conditions concluded in $((time_ns() - runtime_start) / 1.0e9) seconds"
 
@@ -89,7 +91,7 @@ function _assess_identifiability_kic(
         funcs_to_check = vcat(ode.x_vars, ode.parameters)
     end
     half_p = 0.5 + prob_threshold / 2
-    id_funcs = _find_identifiable_functions_kic(ode, known_ic, prob_threshold = half_p)
+    id_funcs = _find_identifiable_functions_kic(ode, known_ic, prob_threshold = half_p, simplify = :absent)
     #funcs_to_check = replace_with_ic(ode, funcs_to_check)
     result = OrderedDict(f => :globally for f in funcs_to_check)