diff --git a/bin/compose-core b/bin/compose-core
index 36d7984..949e979 100755
--- a/bin/compose-core
+++ b/bin/compose-core
@@ -996,7 +996,7 @@ _get_compose_service_def_cached () {
         touch "$cache_file" || return 1
         return 0
     fi
-    value=$(echo "$docker_compose" | shyaml get-value "$service" 2>/dev/null)
+    value=$(echo "$docker_compose" | shyaml get-value "${service//./\\.}" 2>/dev/null)
     [ "$value" == None ] && value=""
     if ! echo "$value" | shyaml get-value "charm" >/dev/null 2>&1; then
         if charm.exists "$service"; then
@@ -1083,7 +1083,7 @@ get_service_def () {
                            "\$_current_docker_compose has been calculated."
     fi
 
-    def=$(echo "$_current_docker_compose" | shyaml get-value "services.$service" 2>/dev/null)
+    def=$(echo "$_current_docker_compose" | shyaml get-value "services.${service//./\\.}" 2>/dev/null)
     if [ -z "$def" ]; then
         err "No definition for service $DARKYELLOW$service$NORMAL in compiled 'docker-compose.yml'."
         return 1