diff --git a/run-cleanup.sh b/run-cleanup.sh
index 77c7860..47d562d 100755
--- a/run-cleanup.sh
+++ b/run-cleanup.sh
@@ -31,10 +31,11 @@ if ! /bin/bash "${SETUP_MERCURIAL}"; then
   exit 2
 fi
 source "${VIRTUALENV}/bin/activate"
-
 # Disable all extensions.
 # (https://stackoverflow.com/questions/46612210/mercurial-disable-all-the-extensions-from-the-command-line)
-HGRCPATH= HGPLAIN= \
+export HGRCPATH=
+export HGPLAIN=
+
 hg \
  --config extensions.renaming_mercurial_source="${BASE}/renaming_mercurial_source.py" \
  --config extensions.hgext.convert= \
@@ -47,7 +48,5 @@ hg \
  --branchmap "${BASE}/data/downward_branchmap.txt"
 
 cd "${CLEANED_REPOSITORY}"
-HGRCPATH= HGPLAIN= \
 hg --config extensions.strip= strip "branch(issue323)" --nobackup
-HGRCPATH= HGPLAIN= \
 hg --config extensions.strip= strip "branch(ipc-2011-fixes)" --nobackup
diff --git a/run-order.sh b/run-order.sh
index 2b87c5a..40fae42 100755
--- a/run-order.sh
+++ b/run-order.sh
@@ -31,18 +31,16 @@ if ! /bin/bash "${SETUP_MERCURIAL}"; then
   exit 2
 fi
 source "${VIRTUALENV}/bin/activate"
-
 # Disable all extensions.
 # (https://stackoverflow.com/questions/46612210/mercurial-disable-all-the-extensions-from-the-command-line)
-HGRCPATH= HGPLAIN= \
+export HGRCPATH=
+export HGPLAIN=
+
 hg clone "http://hg.fast-downward.org" "${ORDERED_REPOSITORY}"
 set +e  # hg incoming has an non-zero exit code if nothing is incoming
 CHANGESETS="$(hg -R "${SRC_REPOSITORY}" incoming --template "{node} " --quiet "${ORDERED_REPOSITORY}")"
 set -e
 if [[ ! -z "${CHANGESETS}" ]]; then
-  echo stripping
-  HGRCPATH= HGPLAIN= \
   hg -R "${ORDERED_REPOSITORY}" --config extensions.strip= strip ${CHANGESETS} --nobackup
 fi
-HGRCPATH=  HGPLAIN= \
 hg -R "${ORDERED_REPOSITORY}" pull "${SRC_REPOSITORY}"