diff --git a/include/rocm_smi/rocm_smi_monitor.h b/include/rocm_smi/rocm_smi_monitor.h
index c6bba27a60..648e159b65 100755
--- a/include/rocm_smi/rocm_smi_monitor.h
+++ b/include/rocm_smi/rocm_smi_monitor.h
@@ -115,6 +115,7 @@ class Monitor {
     std::string path_;
     const RocmSMI_env_vars *env_;
     std::map<rsmi_temperature_type_t, uint32_t> temp_type_index_map_;
+    std::map<rsmi_voltage_type_t, uint32_t> volt_type_index_map_;
 
     // This map uses a 64b index instead of 32b (unlike temp_type_index_map_)
     // for flexibility and simplicity. Currently, some parts of the
@@ -124,7 +125,6 @@ class Monitor {
     // a 64b value. Also, if we need to encode anything else, 64b will give
     // us more room to do so, without excessive changes.
     std::map<uint64_t, rsmi_temperature_type_t> index_temp_type_map_;
-    std::map<rsmi_voltage_type_t, uint32_t> volt_type_index_map_;
     std::map<uint64_t, rsmi_voltage_type_t> index_volt_type_map_;
 };
 
diff --git a/src/rocm_smi_monitor.cc b/src/rocm_smi_monitor.cc
index 15c995ebae..b493113a54 100755
--- a/src/rocm_smi_monitor.cc
+++ b/src/rocm_smi_monitor.cc
@@ -367,15 +367,16 @@ Monitor::setVoltSensorLabelMap(void) {
   }
   auto add_volt_sensor_entry = [&](uint32_t file_index) {
     ret = readMonitor(kMonVoltLabel, file_index, &type_str);
-    rsmi_voltage_type_t t_type = kVoltSensorNameMap.at(type_str);
+    rsmi_voltage_type_t t_type;
+
     // If readMonitor fails, there is no label file for the file_index.
     // In that case, map the type to file index 0, which is not supported
     // and will fail appropriately later when we check for support.
     if (ret) {
-      volt_type_index_map_.insert({t_type, 0});
       index_volt_type_map_.insert({file_index, RSMI_VOLT_TYPE_INVALID});
     } else {
-      volt_type_index_map_.insert({t_type, file_index});
+      t_type = kVoltSensorNameMap.at(type_str);
+      volt_type_index_map_[t_type] = file_index;
       index_volt_type_map_.insert({file_index, t_type});
     }
     return 0;