diff --git a/entrypoint.sh b/entrypoint.sh
index fdb4cb3..8380b1c 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -141,7 +141,7 @@ echo "::add-matcher::$HOME/coq.json"
 docker run -i --init --rm --name=COQ -e WORKDIR="$WORKDIR" -e PACKAGE="$PACKAGE" \
        -v "$HOST_WORKSPACE_REPO:$PWD" -w "$PWD" \
        "$COQ_IMAGE" /bin/bash --login -c "
-endGroup () {  {  init_opts=\"\$-\"; set +x ; } 2> /dev/null; if [ -n \"\$startTime\" ]; then endTime=\$(date -u +%s); echo \"::endgroup::\"; printf \"↳ \"; date -u -d \"@\$((endTime - startTime))\" '+%-Hh %-Mm %-Ss'; echo; unset startTime; else echo 'Error: missing startGroup command.'; case \"\$init_opts\" in  *x*) set -x ;; esac; return 1; fi; case \"\$init_opts\" in  *x*) set -x ;; esac; } ; startGroup () {  {  init_opts=\"\$-\"; set +x ; } 2> /dev/null; if [ -n \"\$startTime\" ]; then endGroup; fi; if [ \$# -ge 1 ]; then groupTitle=\"\$*\"; else groupTitle=\"Unnamed group\"; fi; echo; echo \"::group::\$groupTitle\"; startTime=\$(date -u +%s); case \"\$init_opts\" in  *x*) set -x ;; esac; } # generated from helper.sh
+exec 2>&1 ; endGroup () {  {  init_opts=\"\$-\"; set +x ; } 2> /dev/null; if [ -n \"\$startTime\" ]; then endTime=\$(date -u +%s); echo \"::endgroup::\"; printf \"↳ \"; date -u -d \"@\$((endTime - startTime))\" '+%-Hh %-Mm %-Ss'; echo; unset startTime; else echo 'Error: missing startGroup command.'; case \"\$init_opts\" in  *x*) set -x ;; esac; return 1; fi; case \"\$init_opts\" in  *x*) set -x ;; esac; } ; startGroup () {  {  init_opts=\"\$-\"; set +x ; } 2> /dev/null; if [ -n \"\$startTime\" ]; then endGroup; fi; if [ \$# -ge 1 ]; then groupTitle=\"\$*\"; else groupTitle=\"Unnamed group\"; fi; echo; echo \"::group::\$groupTitle\"; startTime=\$(date -u +%s); case \"\$init_opts\" in  *x*) set -x ;; esac; } # generated from helper.sh
 export PS4='+ \e[33;1m(\$0 @ line \$LINENO) \$\e[0m '; set -ex
 $_OCAML407_COMMAND
 $INPUT_CUSTOM_SCRIPT" script
diff --git a/helper.sh b/helper.sh
index d8f905f..c4b92cf 100755
--- a/helper.sh
+++ b/helper.sh
@@ -45,6 +45,7 @@ main_helper () {
         set -x
         exec > "$gen_file"
 
+        echo -n 'exec 2>&1 ; '  # workaround GHA unflushed stdout/stderr
         minimify endGroup
         echo -n ' ; '
         minimify startGroup