diff --git a/bin/compose-core b/bin/compose-core
index 9a7eabf..344dc71 100755
--- a/bin/compose-core
+++ b/bin/compose-core
@@ -1013,9 +1013,19 @@ export -f docker_add_host_declaration
 
 
 get_running_containers_for_service() {
-    local service="$1"
+    local service="$1" project="$2"
+
+    project=${project:-$PROJECT_NAME}
+
+    [ -n "$project" ] || {
+        err "No project name was defined yet."
+        return 1
+    }
 
-    docker ps --filter label="compose.master-service=$service" --format="{{.ID}}"
+    docker ps \
+           --filter label="compose.project=$project" \
+           --filter label="compose.master-service=$service" \
+           --format="{{.ID}}"
 }
 export -f get_running_containers_for_service