rm -f "$GIT_DIR/rebased-patches"
 
        git format-patch -k --stdout --full-index --ignore-if-in-upstream \
-               --src-prefix=a/ --dst-prefix=b/ \
-               --no-renames $root_flag "$revisions" >"$GIT_DIR/rebased-patches"
+               --src-prefix=a/ --dst-prefix=b/ --no-renames --no-cover-letter \
+               $root_flag "$revisions" >"$GIT_DIR/rebased-patches"
        ret=$?
 
        if test 0 != $ret