diff --git a/runtime/syscalls/SyscallWasi.cpp b/runtime/syscalls/SyscallWasi.cpp
index f3720a6..4c71c1c 100644
--- a/runtime/syscalls/SyscallWasi.cpp
+++ b/runtime/syscalls/SyscallWasi.cpp
@@ -27,6 +27,14 @@
 #  define NOP_SYSCALL(sysnum) ;
 #endif
 
+#if defined(__wasm32__)
+typedef uint32_t _ecv_long;
+#elif defined(__wasm64__)
+typedef uint64_t _ecv_long;
+#else
+typedef uint32_t _ecv_long;
+#endif
+
 /*
   for ioctl syscall
 */
@@ -180,11 +188,17 @@ void RuntimeManager::SVCWasiCall(void) {
     {
       struct _ecv__clockid {
         uint32_t id;
-      } which_clock;
-      which_clock.id = state_gpr.x0.dword;
+      } which_clock = {.id = state_gpr.x0.dword};
       struct timespec emu_tp;
       int clock_time = clock_gettime((clockid_t) &which_clock, &emu_tp);
-      memcpy(TranslateVMA(state_gpr.x1.qword), &emu_tp, sizeof(timespec));
+      struct {
+        uint64_t tv_sec; /* time_t */
+        uint64_t tv_nsec; /* long (assume that the from target architecture is 64bit) */
+      } tp = {
+          .tv_sec = (uint64_t) emu_tp.tv_sec,
+          .tv_nsec = (uint64_t) (_ecv_long) emu_tp.tv_nsec,
+      };
+      memcpy(TranslateVMA(state_gpr.x1.qword), &tp, sizeof(tp));
       state_gpr.x0.qword = (_ecv_reg64_t) clock_time;
     } break;
     case AARCH64_SYS_TGKILL: /* tgkill (pid_t tgid, pid_t pid, int sig) */
@@ -204,7 +218,7 @@ void RuntimeManager::SVCWasiCall(void) {
       break;
     case AARCH64_SYS_UNAME: /* uname (struct old_utsname* buf) */
     {
-      struct __my_utsname {
+      struct __ecv_utsname {
         char sysname[65];
         char nodename[65];
         char relase[65];