diff --git a/src/dfsane.jl b/src/dfsane.jl
index c7a7361e4..aa0dee347 100644
--- a/src/dfsane.jl
+++ b/src/dfsane.jl
@@ -110,7 +110,7 @@ function SciMLBase.__init(prob::NonlinearProblem{uType, iip}, alg::DFSane,
     𝒹, uₙ₋₁, fuₙ, fuₙ₋₁ = copy(uₙ), copy(uₙ), copy(uₙ), copy(uₙ)
 
     if iip
-        f(dx, x) = prob.f(dx, x, p)
+        f( = dx, x) -> prob.f(dx, x, p)
         f(fuₙ₋₁, uₙ₋₁)
 
     else