diff --git a/src/shrpx_log.cc b/src/shrpx_log.cc
index 8459d15e..6966cf94 100644
--- a/src/shrpx_log.cc
+++ b/src/shrpx_log.cc
@@ -228,7 +228,7 @@ Log &Log::operator<<(const ImmutableString &s) {
   return *this;
 }
 
-Log &Log::operator<<(int64_t n) {
+Log &Log::operator<<(long long n) {
   if (n >= 0) {
     return *this << static_cast<uint64_t>(n);
   }
@@ -262,7 +262,7 @@ Log &Log::operator<<(int64_t n) {
   return *this;
 }
 
-Log &Log::operator<<(uint64_t n) {
+Log &Log::operator<<(unsigned long long n) {
   if (flags_ & fmt_hex) {
     write_hex(n);
     return *this;
diff --git a/src/shrpx_log.h b/src/shrpx_log.h
index 1130b8da..17b90536 100644
--- a/src/shrpx_log.h
+++ b/src/shrpx_log.h
@@ -100,12 +100,20 @@ public:
   Log &operator<<(const char *s);
   Log &operator<<(const StringRef &s);
   Log &operator<<(const ImmutableString &s);
-  Log &operator<<(int16_t n) { return *this << static_cast<int64_t>(n); }
-  Log &operator<<(int32_t n) { return *this << static_cast<int64_t>(n); }
-  Log &operator<<(int64_t n);
-  Log &operator<<(uint16_t n) { return *this << static_cast<uint64_t>(n); }
-  Log &operator<<(uint32_t n) { return *this << static_cast<uint64_t>(n); }
-  Log &operator<<(uint64_t n);
+  Log &operator<<(short n) { return *this << static_cast<long long>(n); }
+  Log &operator<<(int n) { return *this << static_cast<long long>(n); }
+  Log &operator<<(long n) { return *this << static_cast<long long>(n); }
+  Log &operator<<(long long n);
+  Log &operator<<(unsigned short n) {
+    return *this << static_cast<unsigned long long>(n);
+  }
+  Log &operator<<(unsigned int n) {
+    return *this << static_cast<unsigned long long>(n);
+  }
+  Log &operator<<(unsigned long n) {
+    return *this << static_cast<unsigned long long>(n);
+  }
+  Log &operator<<(unsigned long long n);
   Log &operator<<(float n) { return *this << static_cast<double>(n); }
   Log &operator<<(double n);
   Log &operator<<(long double n);