diff --git a/vllm/engine/metrics.py b/vllm/engine/metrics.py
index d3560f5fefff1..eb54f5641171e 100644
--- a/vllm/engine/metrics.py
+++ b/vllm/engine/metrics.py
@@ -230,8 +230,8 @@ class StatLogger:
                 "Avg prompt throughput: %.1f tokens/s, "
                 "Avg generation throughput: %.1f tokens/s, "
                 "Running: %d reqs, Swapped: %d reqs, "
-                "Pending: %d reqs, GPU KV cache usage: %.1f%, "
-                "CPU KV cache usage: %.1f%",
+                "Pending: %d reqs, GPU KV cache usage: %.1f%%, "
+                "CPU KV cache usage: %.1f%%",
                 prompt_throughput,
                 generation_throughput,
                 stats.num_running,