diff --git a/stdlib/Mmap/src/Mmap.jl b/stdlib/Mmap/src/Mmap.jl
index df2f4f1a19991b..7d57bf053940d4 100644
--- a/stdlib/Mmap/src/Mmap.jl
+++ b/stdlib/Mmap/src/Mmap.jl
@@ -213,9 +213,7 @@ function mmap(io::IO,
     szfile = convert(Csize_t, len + offset)
     requestedSizeLarger = false
     if !(io isa Mmap.Anonymous)
-        @static if !Sys.isapple()
-            requestedSizeLarger = szfile > filesize(io)
-        end
+        requestedSizeLarger = szfile > filesize(io)
     end
     # platform-specific mmapping
     @static if Sys.isunix()
@@ -231,9 +229,6 @@ function mmap(io::IO,
                 throw(ArgumentError("unable to increase file size to $szfile due to read-only permissions"))
             end
         end
-        @static if Sys.isapple()
-            iswrite && grow && grow!(io, offset, len)
-        end
         # mmap the file
         ptr = ccall(:jl_mmap, Ptr{Cvoid}, (Ptr{Cvoid}, Csize_t, Cint, Cint, RawFD, Int64),
             C_NULL, mmaplen, prot, flags, file_desc, offset_page)