diff --git a/src/space4time.jl b/src/space4time.jl
index f663695..7179509 100644
--- a/src/space4time.jl
+++ b/src/space4time.jl
@@ -174,9 +174,9 @@ function s4time(
 
     #clim_var_cube_2 = permutedims(clim_var_cube_in, (3,2,1))
 
-    climvarmat = collect(reshape(clim_var_cube_in, ((winsize^2), time_n)))
+    climvarmat = reshape(clim_var_cube_in, ((winsize^2), time_n))
 
-    replace!(climvarmat, missing => NaN)
+    climvarmat = replace!(climvarmat, missing => NaN)
 
 
     local_pft1 =