diff --git a/paddle/fluid/platform/device_tracer.cc b/paddle/fluid/platform/device_tracer.cc
index 90ab85905d5e00e61d8fa91cb61ce919b497ebfb..d9e2afadaf8ec439d158e57c94d3e6e684bce116 100644
--- a/paddle/fluid/platform/device_tracer.cc
+++ b/paddle/fluid/platform/device_tracer.cc
@@ -273,7 +273,6 @@ class DeviceTracerImpl : public DeviceTracer {
     proto::Profile profile_pb;
     profile_pb.set_start_ns(start_ns_);
     profile_pb.set_end_ns(end_ns_);
-    std::string kernel_name;
     for (const KernelRecord &r : kernel_records_) {
       if (correlations_.find(r.correlation_id) == correlations_.end()) {
         fprintf(stderr, "cannot relate a kernel activity\n");