diff --git a/src/memtracer/allocator.cpp b/src/memtracer/allocator.cpp
index e83eccdb5..5eaecb991 100644
--- a/src/memtracer/allocator.cpp
+++ b/src/memtracer/allocator.cpp
@@ -46,7 +46,7 @@ mt_visible void *calloc(size_t nelem, size_t size)
     return calloc_buffer;
   }
   size_t alloc_size = nelem * size;
-  void * ptr        = malloc(alloc_size);
+  void  *ptr        = malloc(alloc_size);
   if (ptr == NULL) [[unlikely]] {
     return NULL;
   }
@@ -109,7 +109,7 @@ mt_visible int munmap(void *addr, size_t length)
 mt_visible char *strdup(const char *s) MT_THROW
 {
   size_t len = strlen(s);
-  char * p   = (char *)malloc(len + 1);
+  char  *p   = (char *)malloc(len + 1);
   if (p == NULL) {
     return NULL;
   }
@@ -120,9 +120,9 @@ mt_visible char *strdup(const char *s) MT_THROW
 
 mt_visible char *strndup(const char *s, size_t n) MT_THROW
 {
-  const char * end = (const char *)memchr(s, 0, n);
+  const char  *end = (const char *)memchr(s, 0, n);
   const size_t m   = (end != NULL ? (size_t)(end - s) : n);
-  char *       t   = (char *)malloc(m + 1);
+  char        *t   = (char *)malloc(m + 1);
   if (t == NULL)
     return NULL;
   memcpy(t, s, m);
@@ -178,7 +178,7 @@ mt_visible long int syscall(long int __sysno, ...)
   exit(-1);
 }
 #elif defined(__MACH__)
-mt_visible void    *brk(const void *addr)
+mt_visible void *brk(const void *addr)
 {
   MEMTRACER_LOG("brk not supported\n");
   exit(-1);
diff --git a/src/memtracer/memtracer.cpp b/src/memtracer/memtracer.cpp
index 3e6810b5d..beafdfd83 100644
--- a/src/memtracer/memtracer.cpp
+++ b/src/memtracer/memtracer.cpp
@@ -61,7 +61,7 @@ void MemTracer::init()
   // init memory limit
   const char *memory_limit_str = std::getenv("MT_MEMORY_LIMIT");
   if (memory_limit_str != nullptr) {
-    char *             end;
+    char              *end;
     unsigned long long value = std::strtoull(memory_limit_str, &end, 10);
     if (end != memory_limit_str && *end == '\0') {
       MT.set_memory_limit(static_cast<size_t>(value));
@@ -73,7 +73,7 @@ void MemTracer::init()
   // init print_interval
   const char *print_interval_ms_str = std::getenv("MT_PRINT_INTERVAL_MS");
   if (print_interval_ms_str != nullptr) {
-    char *             end;
+    char              *end;
     unsigned long long value = std::strtoull(print_interval_ms_str, &end, 10);
     if (end != print_interval_ms_str && *end == '\0') {
       MT.set_print_interval(static_cast<size_t>(value));
@@ -148,7 +148,7 @@ void MemTracer::init_hook_funcs_impl()
 void MemTracer::stat()
 {
   const size_t print_interval_ms = MT.print_interval();
-  const size_t sleep_interval = 100;  // 100 ms
+  const size_t sleep_interval    = 100;  // 100 ms
   while (!MT.is_stop()) {
     if (REACH_TIME_INTERVAL(print_interval_ms)) {
       // TODO: optimize the output format