diff --git a/src/raphson.jl b/src/raphson.jl
index 111a61a7a..81a05e34b 100644
--- a/src/raphson.jl
+++ b/src/raphson.jl
@@ -258,7 +258,7 @@ end
 ## some helper func ###
 
 function value_f(cache::NewtonRaphsonCache, x)
-    iip = get_iip(cache.prob)
+    iip = SciMLBase.isinplace(cache.prob)
     @unpack f, p = cache
     if iip
         res = zero(x)
diff --git a/src/utils.jl b/src/utils.jl
index 98a6cfcb4..eacf06727 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -158,8 +158,5 @@ function rfunc(r::R, c2::R, M::R, γ1::R, γ2::R, β::R) where {R <: Real} # R-f
     end
 end
 
-function get_iip(prob::NonlinearProblem{uType, iip}) where {uType, iip}
-    iip
-end