diff --git a/vllm/v1/metrics/prometheus.py b/vllm/v1/metrics/prometheus.py
index 1eacb785aa84..c8740276713b 100644
--- a/vllm/v1/metrics/prometheus.py
+++ b/vllm/v1/metrics/prometheus.py
@@ -64,7 +64,7 @@ def unregister_vllm_metrics():
     registry = REGISTRY
     # Unregister any existing vLLM collectors
     for collector in list(registry._collector_to_names):
-        if hasattr(collector, "_name") and "vllm" in collector._name:
+        if hasattr(collector, "_name") and collector._name.startswith("vllm:"):
             registry.unregister(collector)