diff --git a/functions.sh b/functions.sh
index cd61979..425552b 100755
--- a/functions.sh
+++ b/functions.sh
@@ -90,10 +90,10 @@ function build_dependency {
             if [ "$PRESERVE_OUT_DIRECTORY_STRUCTURE" = true ] && [ "$file_dir" != '.' ]; then
                 mkdir -p "$proj_root_dir/$OUTDIR/$file_dir"
                 mkdir -p "$proj_root_dir/$OBJDIR/dynamic_libs/$file_dir"
-                cp -v "$file" "$proj_root_dir/$OUTDIR/$file"
+                cp -v -u --preserve=timestamps "$file" "$proj_root_dir/$OUTDIR/$file"
                 ln -sfv "$real_file" "$proj_root_dir/$OBJDIR/dynamic_libs/$file"
             else
-                cp -v "$file" "$proj_root_dir/$OUTDIR/"
+                cp -v -u --preserve=timestamps "$file" "$proj_root_dir/$OUTDIR/"
                 ln -sfv "$real_file" "$proj_root_dir/$OBJDIR/dynamic_libs/"
             fi
         done
@@ -104,9 +104,9 @@ function build_dependency {
             if [ "$PRESERVE_OUT_DIRECTORY_STRUCTURE" = true ]; then
                 file_dir=$(dirname $file)
                 mkdir -p "$proj_root_dir/$OUTDIR/$file_dir"
-                cp -v "$file" "$proj_root_dir/$OUTDIR/$file"
+                cp -v -u --preserve=timestamps "$file" "$proj_root_dir/$OUTDIR/$file"
             else
-                cp -v "$file" "$proj_root_dir/$OUTDIR/"
+                cp -v -u --preserve=timestamps "$file" "$proj_root_dir/$OUTDIR/"
             fi
         done
     fi