diff --git a/build/tools/post-release.sh b/build/tools/post-release.sh
index 79e412d56b..4c49234a24 100755
--- a/build/tools/post-release.sh
+++ b/build/tools/post-release.sh
@@ -3,20 +3,22 @@
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
+topdir=`dirname $0`/../..
+
 # Build the file list for sha1sums, from `docs/release.md`
-declare -a files=(`sed -n '/^## Download Verification/,/^## Binaries/p' ../../docs/release.md | sed -n -E 's/^\s*0{40}\s{2}(wx.*)/\1/p'`)
+declare -a files=(`sed -n '/^## Download Verification/,/^## Binaries/p' $topdir/docs/release.md | sed -n -E 's/^\s*0{40}\s{2}(wx.*)/\1/p'`)
 
 # Get the release version
-ver_string=`grep '#define wxVERSION_STRING ' ./../../include/wx/version.h | sed 's/^.*"wxWidgets \(.*\)")/\1/'`
+ver_string=`grep '#define wxVERSION_STRING ' $topdir/include/wx/version.h | sed 's/^.*"wxWidgets \(.*\)")/\1/'`
 
 for i in "${files[@]}"
 do
     # compute sha1sum
-    sha1sum=`sha1sum ./../../distrib/release/$ver_string/$i`
+    sha1sum=`sha1sum $topdir/distrib/release/$ver_string/$i`
 
     # save the sha1sum for this file
-    sed -i -E "/^\s*[0]{40}\s{2}wx/ s/(^\s*)[0]{40}(\s{2}$i)/\1$sha1sum\2/" ./../../docs/release.md
+    sed -i -E "/^\s*[0]{40}\s{2}wx/ s/(^\s*)[0]{40}(\s{2}$i)/\1$sha1sum\2/" $topdir/docs/release.md
 done
 
 # Commit sha1sum related changes
-git commit -m "Update released files sha1sums after $ver_string release" ./../../docs/release.md
+git commit -m "Update released files sha1sums after $ver_string release" $topdir/docs/release.md
diff --git a/build/tools/pre-release.sh b/build/tools/pre-release.sh
index 4a3406e1cf..9b0ced65df 100755
--- a/build/tools/pre-release.sh
+++ b/build/tools/pre-release.sh
@@ -33,26 +33,28 @@ fi
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
+topdir=`dirname $0`/../..
+
 # get the month name and the year, see $(date +'%B %Y')
 # then use it in the relevant line (one before last)
-sed -i "/^The wxWidgets Team, / s/.*/The wxWidgets Team, $(date +'%B %Y')/" ./../../docs/readme.txt
+sed -i "/^The wxWidgets Team, / s/.*/The wxWidgets Team, $(date +'%B %Y')/" $topdir/docs/readme.txt
 echo Updated date in docs/readme.txt
 
 # reset checksums to a string of 40 0-s, see $(printf '%.40d' 0)
-sed -i -E "/^\s*[0-9a-f]{40}\s{1,2}wx/ s/(\s*)[0-9a-f]{40}(\s{1,2}wx)/\1$(printf '%.40d' 0)\2/" ./../../docs/release.md
+sed -i -E "/^\s*[0-9a-f]{40}\s{1,2}wx/ s/(\s*)[0-9a-f]{40}(\s{1,2}wx)/\1$(printf '%.40d' 0)\2/" $topdir/docs/release.md
 echo Reset checksums in docs/release.md
 
 # get current date, see $(date +'%Y-%m-%d')
 # then use it in the line containing "X.X.X: (not released yet)"
-sed -i "/^[3-9]\.[0-9]\.[0-9]: (not released yet)$/ s/not released yet/released $(date +'%Y-%m-%d')/" ./../../docs/changes.txt
+sed -i "/^[3-9]\.[0-9]\.[0-9]: (not released yet)$/ s/not released yet/released $(date +'%Y-%m-%d')/" $topdir/docs/changes.txt
 echo Updated release date in docs/changes.txt
 
 # get current date, see $(date +'%B %d, %Y')
 # then use it in the line starting with @date
-sed -i "/^@date / s/.*/@date $(date +'%B %d, %Y')/" ./../../docs/doxygen/mainpages/manual.h
+sed -i "/^@date / s/.*/@date $(date +'%B %d, %Y')/" $topdir/docs/doxygen/mainpages/manual.h
 echo Updated date in docs/doxygen/mainpages/manual.h
 
 # get current date, see $(date +'%B %d, %Y')
 # then use it in the first line
-sed -i "1s/^.* -- /$(date +'%B %d, %Y') -- /" ./../../docs/publicity/announce.txt
+sed -i "1s/^.* -- /$(date +'%B %d, %Y') -- /" $topdir/docs/publicity/announce.txt
 echo Updated date in docs/publicity/announce.txt