diff --git a/scripts/install b/scripts/install
index 84ef3db..aad55d3 100644
--- a/scripts/install
+++ b/scripts/install
@@ -6,7 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
-#source ./_common.sh
+source ./_common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -37,6 +37,12 @@ test ! -e "$final_path" || ynh_die "This path already contains a folder"
 # Register (book) web path
 ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
 
+# Check if .well-known is available for this domain.
+if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+then
+    ynh_die --message="Another app already uses the domain $domain to serve a caldav/carddav feature. Please use another domain."
+fi
+
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 686f8b0..ea0a26f 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -6,7 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
-# source ../settings/scripts/_common.sh
+source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -38,6 +38,12 @@ ynh_webpath_available --domain=$domain --path_url=$path_url \
 test ! -d $final_path \
 	|| ynh_die --message="There is already a directory: $final_path "
 
+# Check if .well-known is available for this domain.
+if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+then
+    ynh_die --message="Another app already uses the domain $domain to serve a caldav/carddav feature. Please use another domain."
+fi
+
 #=================================================
 # STANDARD RESTORATION STEPS
 #=================================================