diff --git a/src/dnode/src/dnodeSystem.c b/src/dnode/src/dnodeSystem.c
index 3efa1c728d8b6eac72ea2724df918dc4340f22c2..2fa738e480b7548541987733918f32c916cfbf70 100644
--- a/src/dnode/src/dnodeSystem.c
+++ b/src/dnode/src/dnodeSystem.c
@@ -29,7 +29,7 @@ int32_t main(int32_t argc, char *argv[]) {
   for (int32_t i = 1; i < argc; ++i) {
     if (strcmp(argv[i], "-c") == 0) {
       if (i < argc - 1) {        
-        if (strlen(argv[++i]) > TSDB_FILENAME_LEN - 1) {
+        if (strlen(argv[++i]) >= TSDB_FILENAME_LEN) {
           printf("config file path overflow");
           exit(EXIT_FAILURE);
         }
diff --git a/src/kit/shell/src/shellDarwin.c b/src/kit/shell/src/shellDarwin.c
index 439ca6edada6b9ffd1f2d2a0385e94ec7831913e..1a75a2aa85c426a213fc3a8f363a454d3e2874d4 100644
--- a/src/kit/shell/src/shellDarwin.c
+++ b/src/kit/shell/src/shellDarwin.c
@@ -97,7 +97,7 @@ void shellParseArgument(int argc, char *argv[], struct arguments *arguments) {
       }
     } else if (strcmp(argv[i], "-c") == 0) {
       if (i < argc - 1) { 
-        if (strlen(argv[++i]) > TSDB_FILENAME_LEN - 1) {
+        if (strlen(argv[++i]) >= TSDB_FILENAME_LEN) {
           fprintf(stderr, "config file path: %s overflow max len %d\n", argv[i], TSDB_FILENAME_LEN - 1);
           exit(EXIT_FAILURE);
         }
diff --git a/src/kit/shell/src/shellLinux.c b/src/kit/shell/src/shellLinux.c
index 7d035126c00351444220ab66ea340bc362219ebc..829ceb9e5f19107ef65c5a3884bffd8a03e593b8 100644
--- a/src/kit/shell/src/shellLinux.c
+++ b/src/kit/shell/src/shellLinux.c
@@ -81,7 +81,7 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state) {
         fprintf(stderr, "Invalid path %s\n", arg);
         return -1;
       }       
-      if (strlen(full_path.we_wordv[0]) > TSDB_FILENAME_LEN - 1) {
+      if (strlen(full_path.we_wordv[0]) >= TSDB_FILENAME_LEN) {
         fprintf(stderr, "config file path: %s overflow max len %d\n", full_path.we_wordv[0], TSDB_FILENAME_LEN - 1);
         wordfree(&full_path);
         return -1;
diff --git a/src/kit/shell/src/shellWindows.c b/src/kit/shell/src/shellWindows.c
index cf96bce5a89d76216535b68d745ea9b826cd0b01..8a7996d6825626e7bd8ed51c429916cba541ac79 100644
--- a/src/kit/shell/src/shellWindows.c
+++ b/src/kit/shell/src/shellWindows.c
@@ -77,7 +77,7 @@ void shellParseArgument(int argc, char *argv[], struct arguments *arguments) {
       }
     } else if (strcmp(argv[i], "-c") == 0) {
       if (i < argc - 1) {   
-        if (strlen(argv[++i]) > TSDB_FILENAME_LEN - 1) {
+        if (strlen(argv[++i]) >= TSDB_FILENAME_LEN) {
           fprintf(stderr, "config file path: %s overflow max len %d\n", argv[i], TSDB_FILENAME_LEN - 1);
           exit(EXIT_FAILURE);
         }
diff --git a/src/kit/taosdump/taosdump.c b/src/kit/taosdump/taosdump.c
index 6cb57ef0d5f5d33df97ce8f1666bce430f7ef016..ee792c51166b090dd8ea104120ae5fd105791948 100644
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
@@ -177,8 +177,8 @@ typedef struct SDumpArguments {
   char *password;
   uint16_t port;
   // output file
-  char output[TSDB_FILENAME_LEN + 1];
-  char input[TSDB_FILENAME_LEN + 1];
+  char output[TSDB_FILENAME_LEN];
+  char input[TSDB_FILENAME_LEN];
   char *encode;
   // dump unit option
   bool all_databases;
diff --git a/src/util/src/tconfig.c b/src/util/src/tconfig.c
index 203a34fd15341acf263e74166717a14d4787a23d..543a84dc44cf3105aee4583bc31882df37702fad 100644
--- a/src/util/src/tconfig.c
+++ b/src/util/src/tconfig.c
@@ -242,7 +242,7 @@ void taosReadGlobalLogCfg() {
   wordexp_t full_path;
   wordexp(configDir, &full_path, 0);
   if (full_path.we_wordv != NULL && full_path.we_wordv[0] != NULL) {    
-    if (strlen(full_path.we_wordv[0]) > TSDB_FILENAME_LEN - 1) {
+    if (strlen(full_path.we_wordv[0]) >= TSDB_FILENAME_LEN) {
       printf("\nconfig file: %s path overflow max len %d, all variables are set to default\n", full_path.we_wordv[0], TSDB_FILENAME_LEN - 1);
       wordfree(&full_path);
       return;