diff --git a/test/packet_inject/packet_inject_test.h b/test/packet_inject/packet_inject_test.h
index f69680c..2ac598c 100644
--- a/test/packet_inject/packet_inject_test.h
+++ b/test/packet_inject/packet_inject_test.h
@@ -8,6 +8,7 @@ extern "C"
 #include <stdarg.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <limits.h>
 #include <gtest/gtest.h>
 
 #include "stellar/stellar.h"
@@ -34,7 +35,7 @@ struct packet_inject_case
 
 static inline void system_cmd(const char *cmd, ...)
 {
-    char buf[1024] = {0};
+    char buf[PATH_MAX] = {0};
     va_list args;
 
     va_start(args, cmd);
@@ -106,9 +107,9 @@ static inline int replace_file_string(const char *file, const char *old_str, con
 static inline void expect_cmp_inject(const char *expect_pcap_file, const char *inject_pcap_file, const char *diff_skip_pattern, int idx)
 {
     struct stat s;
-    char expect_pcap_json[1024] = {0};
-    char inject_pcap_json[1024] = {0};
-    char diff_json_txt[1024] = {0};
+    char expect_pcap_json[PATH_MAX] = {0};
+    char inject_pcap_json[PATH_MAX] = {0};
+    char diff_json_txt[PATH_MAX] = {0};
 
     snprintf(expect_pcap_json, sizeof(expect_pcap_json), "expect_pcap_%d.json", idx);
     snprintf(inject_pcap_json, sizeof(inject_pcap_json), "inject_pcap_%d.json", idx);
@@ -144,7 +145,7 @@ static inline void expect_cmp_inject(const char *expect_pcap_file, const char *i
 static inline void packet_inject_test(struct packet_inject_case *test)
 {
     // create directory
-    char dumpfile_dir[1024] = {0};
+    char dumpfile_dir[PATH_MAX] = {0};
     snprintf(dumpfile_dir, sizeof(dumpfile_dir), "%s/input/", test->work_dir);
     system_cmd("rm -rf %s", test->work_dir);
     system_cmd("mkdir -p %s/input/", test->work_dir);
@@ -168,8 +169,8 @@ static inline void packet_inject_test(struct packet_inject_case *test)
     system_cmd("cp libpacket_inject.so        %s/plugin/", test->work_dir);
 
     // run
-    char cwd[2048] = {0};
-    char temp[2048] = {0};
+    char cwd[PATH_MAX] = {0};
+    char temp[PATH_MAX*2] = {0};
     getcwd(cwd, sizeof(cwd));
     chdir(test->work_dir);
     snprintf(temp, sizeof(temp), "dumpfile_dir = \"%s\"", dumpfile_dir);