diff --git a/src/caches/firk_caches.jl b/src/caches/firk_caches.jl
index bef7190fd8..cf8bff5f11 100644
--- a/src/caches/firk_caches.jl
+++ b/src/caches/firk_caches.jl
@@ -82,7 +82,7 @@ function alg_cache(alg::RadauIIA5,u,rate_prototype,uEltypeNoUnits,uBottomEltypeN
   k = similar(rate_prototype); k2 = similar(rate_prototype); k3 = similar(rate_prototype)
   fw1 = similar(rate_prototype); fw2 = similar(rate_prototype); fw3 = similar(rate_prototype)
 
-  J = fill(zero(uEltypeNoUnits),length(u),length(u))
+  J = false .* rate_prototype .* rate_prototype'
   W1 = similar(J); W2 = similar(J, Complex{eltype(J)})
 
   du1 = similar(rate_prototype)
diff --git a/src/caches/linear_caches.jl b/src/caches/linear_caches.jl
index a577b171b9..eccbfd972b 100644
--- a/src/caches/linear_caches.jl
+++ b/src/caches/linear_caches.jl
@@ -10,7 +10,7 @@ end
 
 function alg_cache(alg::MidpointSplitting,u,rate_prototype,uEltypeNoUnits,
                    tTypeNoUnits,uprev,uprev2,f,t,dt,reltol,p,calck,::Type{Val{true}})
-  W = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+  W = false .* rate_prototype .* rate_prototype' # uEltype?
   k = zero(rate_prototype); fsalfirst = zero(rate_prototype)
   MidpointSplittingCache(u,uprev,uprev2,similar(u),fsalfirst,W,k)
 end
diff --git a/src/caches/rosenbrock_caches.jl b/src/caches/rosenbrock_caches.jl
index f69257bd3b..21d121a465 100644
--- a/src/caches/rosenbrock_caches.jl
+++ b/src/caches/rosenbrock_caches.jl
@@ -66,7 +66,7 @@ function alg_cache(alg::Rosenbrock23,u,rate_prototype,uEltypeNoUnits,uBottomElty
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = zero(rate_prototype .* rate_prototype') # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -99,7 +99,7 @@ function alg_cache(alg::Rosenbrock32,u,rate_prototype,uEltypeNoUnits,uBottomElty
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -202,7 +202,7 @@ function alg_cache(alg::ROS3P,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUni
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -264,7 +264,7 @@ function alg_cache(alg::Rodas3,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUn
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -344,7 +344,7 @@ function alg_cache(alg::RosShamp4,u,rate_prototype,uEltypeNoUnits,uBottomEltypeN
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -382,7 +382,7 @@ function alg_cache(alg::Veldd4,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUn
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -420,7 +420,7 @@ function alg_cache(alg::Velds4,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUn
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -458,7 +458,7 @@ function alg_cache(alg::GRK4T,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUni
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -496,7 +496,7 @@ function alg_cache(alg::GRK4A,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUni
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -534,7 +534,7 @@ function alg_cache(alg::Ros4LStab,u,rate_prototype,uEltypeNoUnits,uBottomEltypeN
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -615,7 +615,7 @@ function alg_cache(alg::Rodas4,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUn
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -658,7 +658,7 @@ function alg_cache(alg::Rodas42,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoU
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -701,7 +701,7 @@ function alg_cache(alg::Rodas4P,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoU
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
@@ -787,7 +787,7 @@ function alg_cache(alg::Rodas5,u,rate_prototype,uEltypeNoUnits,uBottomEltypeNoUn
     W = WOperator(f, dt, true)
     J = nothing # is J = W.J better?
   else
-    J = fill(zero(uEltypeNoUnits),length(u),length(u)) # uEltype?
+    J = false .* rate_prototype .* rate_prototype' # uEltype?
     W = similar(J)
   end
   tmp = zero(rate_prototype)
diff --git a/src/nlsolve/utils.jl b/src/nlsolve/utils.jl
index c89dd0fa39..e5b83860c9 100644
--- a/src/nlsolve/utils.jl
+++ b/src/nlsolve/utils.jl
@@ -117,7 +117,7 @@ DiffEqBase.@def iipnlsolve begin
         W = WOperator(f, dt, true)
         J = nothing # is J = W.J better?
       else
-        J = zero(u .* u')
+        J = false .* u .* u'
         W = similar(J)
       end
     end