diff --git a/entrypoint b/entrypoint
index 1216bed..0a09caa 100755
--- a/entrypoint
+++ b/entrypoint
@@ -62,6 +62,10 @@ function createUser() {
     chown root:root /home/$user
     chmod 755 /home/$user
 
+    # Retrieving user id to use it in chown commands instead of the user name
+    # to avoid problems on alpine when the user name contains a '.'
+    uid=`id $user -u`
+
     if [ -n "$pass" ]; then
         echo "$user:$pass" | chpasswd $chpasswdOptions
     else
@@ -71,7 +75,7 @@ function createUser() {
     # Add SSH keys to authorized_keys with valid permissions
     if [ -d /home/$user/.ssh/keys ]; then
         cat /home/$user/.ssh/keys/* >> /home/$user/.ssh/authorized_keys
-        chown $user /home/$user/.ssh/authorized_keys
+        chown $uid /home/$user/.ssh/authorized_keys
         chmod 600 /home/$user/.ssh/authorized_keys
     fi
 
@@ -82,7 +86,7 @@ function createUser() {
             dirPath=/home/$user/$dirPath
             echo "Creating and/or setting permissions on $dirPath"
             mkdir -p $dirPath
-            chown -R $user:users $dirPath
+            chown -R $uid:users $dirPath
         done
     fi
 }