diff --git a/src/dense/stiff_addsteps.jl b/src/dense/stiff_addsteps.jl
index f61d0d2d75..87d1da4f35 100644
--- a/src/dense/stiff_addsteps.jl
+++ b/src/dense/stiff_addsteps.jl
@@ -522,7 +522,7 @@ end
 function _ode_addsteps!(k, t, uprev, u, dt, f, p, cache::Rosenbrock5ConstantCache,
     always_calc_begin = false, allow_calc_end = true,
     force_calc_end = false)
-    if length(k) < 2 || always_calc_begin
+    if length(k) < 3 || always_calc_begin
         @unpack tf, uf = cache
         @unpack a21, a31, a32, a41, a42, a43, a51, a52, a53, a54, a61, a62, a63, a64, a65, C21, C31, C32, C41, C42, C43, C51, C52, C53, C54, C61, C62, C63, C64, C65, C71, C72, C73, C74, C75, C76, C81, C82, C83, C84, C85, C86, C87, gamma, d1, d2, d3, d4, d5, c2, c3, c4, c5 = cache.tab
 
@@ -644,7 +644,7 @@ function _ode_addsteps!(k, t, uprev, u, dt, f, p, cache::Rosenbrock5ConstantCach
              h48 * k8
         copyat_or_push!(k, 1, k₁)
         copyat_or_push!(k, 2, k₂)
-        copyat_or_push!(k, 2, k₃)
+        copyat_or_push!(k, 3, k₃)
     end
     nothing
 end
@@ -652,7 +652,7 @@ end
 function _ode_addsteps!(k, t, uprev, u, dt, f, p, cache::Rosenbrock5Cache,
     always_calc_begin = false, allow_calc_end = true,
     force_calc_end = false)
-    if length(k) < 2 || always_calc_begin
+    if length(k) < 3 || always_calc_begin
         @unpack du, du1, du2, tmp, k1, k2, k3, k4, k5, k6, k7, k8, dT, J, W, uf, tf, linsolve_tmp, jac_config, fsalfirst, weight = cache
         @unpack a21, a31, a32, a41, a42, a43, a51, a52, a53, a54, a61, a62, a63, a64, a65, C21, C31, C32, C41, C42, C43, C51, C52, C53, C54, C61, C62, C63, C64, C65, C71, C72, C73, C74, C75, C76, C81, C82, C83, C84, C85, C86, C87, gamma, d1, d2, d3, d4, d5, c2, c3, c4, c5 = cache.tab
 
@@ -857,7 +857,7 @@ end
 function _ode_addsteps!(k, t, uprev, u, dt, f, p, cache::Rosenbrock5Cache{<:Array},
     always_calc_begin = false, allow_calc_end = true,
     force_calc_end = false)
-    if length(k) < 2 || always_calc_begin
+    if length(k) < 3 || always_calc_begin
         @unpack du, du1, du2, k1, k2, k3, k4, k5, k6, k7, k8, dT, J, W, uf, tf, linsolve_tmp, jac_config, fsalfirst = cache
         @unpack a21, a31, a32, a41, a42, a43, a51, a52, a53, a54, a61, a62, a63, a64, a65, C21, C31, C32, C41, C42, C43, C51, C52, C53, C54, C61, C62, C63, C64, C65, C71, C72, C73, C74, C75, C76, C81, C82, C83, C84, C85, C86, C87, gamma, d1, d2, d3, d4, d5, c2, c3, c4, c5 = cache.tab