diff --git a/evomaintenance.sh b/evomaintenance.sh
index 95b2e39..5071141 100644
--- a/evomaintenance.sh
+++ b/evomaintenance.sh
@@ -55,22 +55,22 @@ echo "${BLOB}" >> "${LOGFILE}"
 GIT_BIN=$(command -v git)
 
 if test -x "${GIT_BIN}"; then
-    # loop on possible GIT repositories
-    for dir in /etc/.git /etc/bind/.git; do
-        # tell Git where to find the repository (no need to `cd …` there)
-        export GIT_DIR="${dir}"
-        # If the repository exists, try to commit changes
-        if test -d "${GIT_DIR}"; then
-            ${GIT_BIN} add .
-            ${GIT_BIN} commit --all --message "${TEXTE}" --author="${USER} <${USER}@evolix.net>" --quiet
+    # loop on possible directories managed by GIT
+    for dir in /etc /etc/bind; do
+        # tell Git where to find the repository and the work tree (no need to `cd …` there)
+        export GIT_DIR="${dir}/.git" GIT_WORK_TREE="${dir}"
+        # If the repository and the work tree exist, try to commit changes
+        if test -d "${GIT_DIR}" && test -d "${GIT_WORK_TREE}"; then
+            ${GIT_BIN} add --all
+            ${GIT_BIN} commit --message "${TEXTE}" --author="${USER} <${USER}@evolix.net>" --quiet
             # Add the SHA to the log file if something has been committed
             if [ "$?" = "0" ]; then
-              SHA=$(git rev-parse --short HEAD)
-              echo "${GIT_DIR} : ${SHA}" >> "${LOGFILE}"
+              SHA=$(git rev-parse HEAD)
+              echo "${dir} : ${SHA}" >> "${LOGFILE}"
             fi
         fi
-
-        unset GIT_DIR
+        # unset environment variables to prevent accidental influence on other git commands
+        unset GIT_DIR GIT_WORK_TREE
     done
 fi