diff --git a/rtc_base/logging.cc b/rtc_base/logging.cc
index d07a7e75e7..6039c4f668 100644
--- a/rtc_base/logging.cc
+++ b/rtc_base/logging.cc
@@ -33,6 +33,7 @@
 static const int kMaxLogLineSize = 1024 - 60;
 #endif  // WEBRTC_MAC && !defined(WEBRTC_IOS) || WEBRTC_ANDROID
 
+#include <inttypes.h>
 #include <stdio.h>
 #include <time.h>
 
@@ -110,9 +111,13 @@ LogMessage::LogMessage(const char* file,
     // Also ensure WallClockStartTime is initialized, so that it matches
     // LogStartTime.
     WallClockStartTime();
-    print_stream_ << "[" << rtc::LeftPad('0', 3, rtc::ToString(time / 1000))
-                  << ":" << rtc::LeftPad('0', 3, rtc::ToString(time % 1000))
-                  << "] ";
+    // TODO(kwiberg): Switch to absl::StrFormat, if binary size is ok.
+    char timestamp[50];  // Maximum string length of an int64_t is 20.
+    int len =
+        snprintf(timestamp, sizeof(timestamp), "[%03" PRId64 ":%03" PRId64 "]",
+                 time / 1000, time % 1000);
+    RTC_DCHECK_LT(len, sizeof(timestamp));
+    print_stream_ << timestamp;
   }
 
   if (thread_) {
diff --git a/rtc_base/string_utils.cc b/rtc_base/string_utils.cc
index dfbb548050..1720c62d5e 100644
--- a/rtc_base/string_utils.cc
+++ b/rtc_base/string_utils.cc
@@ -50,10 +50,4 @@ std::string ToHex(const int i) {
   return std::string(buffer);
 }
 
-std::string LeftPad(char padding, unsigned length, std::string s) {
-  if (s.length() >= length)
-    return s;
-  return std::string(length - s.length(), padding) + s;
-}
-
 }  // namespace rtc
diff --git a/rtc_base/string_utils.h b/rtc_base/string_utils.h
index 3518702ec0..23c55cb893 100644
--- a/rtc_base/string_utils.h
+++ b/rtc_base/string_utils.h
@@ -88,8 +88,6 @@ std::string string_trim(const std::string& s);
 // TODO(jonasolsson): replace with absl::Hex when that becomes available.
 std::string ToHex(const int i);
 
-std::string LeftPad(char padding, unsigned length, std::string s);
-
 }  // namespace rtc
 
 #endif  // RTC_BASE_STRING_UTILS_H_