diff --git a/include/neuron/define.h b/include/neuron/define.h
index d6a6c7f0..dfdbca33 100644
--- a/include/neuron/define.h
+++ b/include/neuron/define.h
@@ -20,7 +20,7 @@
 #ifndef _NEU_DEFINE_H_
 #define _NEU_DEFINE_H_
 
-#define NEU_TAG_NAME_LEN 32
+#define NEU_TAG_NAME_LEN 48
 #define NEU_TAG_ADDRESS_LEN 128
 #define NEU_TAG_DESCRIPTION_LEN 128
 #define NEU_GROUP_NAME_LEN 32
diff --git a/src/adapter/driver/driver.c b/src/adapter/driver/driver.c
index 6a9b093d..b1c82a71 100644
--- a/src/adapter/driver/driver.c
+++ b/src/adapter/driver/driver.c
@@ -502,7 +502,7 @@ int neu_adapter_driver_add_tag(neu_adapter_driver_t *driver, const char *group,
     int      ret  = NEU_ERR_SUCCESS;
     group_t *find = NULL;
 
-    if (strlen(tag->name) > NEU_TAG_NAME_LEN) {
+    if (strlen(tag->name) >= NEU_TAG_NAME_LEN) {
         return NEU_ERR_TAG_NAME_TOO_LONG;
     }
 
@@ -568,7 +568,7 @@ int neu_adapter_driver_update_tag(neu_adapter_driver_t *driver,
     int      ret  = NEU_ERR_SUCCESS;
     group_t *find = NULL;
 
-    if (strlen(tag->name) > NEU_TAG_NAME_LEN) {
+    if (strlen(tag->name) >= NEU_TAG_NAME_LEN) {
         return NEU_ERR_TAG_NAME_TOO_LONG;
     }