diff --git a/base/Android.bp b/base/Android.bp
index 5d70d47..7b0ba11 100644
--- a/base/Android.bp
+++ b/base/Android.bp
@@ -50,6 +50,7 @@
         "quick_exit.cpp",
         "stringprintf.cpp",
         "strings.cpp",
+        "threads.cpp",
         "test_utils.cpp",
     ],
 
diff --git a/base/include/android-base/threads.h b/base/include/android-base/threads.h
new file mode 100644
index 0000000..85e65ba
--- /dev/null
+++ b/base/include/android-base/threads.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_BASE_THREADS_H
+#define ANDROID_BASE_THREADS_H
+
+#include <stdint.h>
+
+namespace android {
+namespace base {
+uint64_t GetThreadId();
+}
+}  // namespace android
+
+#endif
diff --git a/base/logging.cpp b/base/logging.cpp
index a31feef..30d7f8d 100644
--- a/base/logging.cpp
+++ b/base/logging.cpp
@@ -21,6 +21,7 @@
 #include "android-base/logging.h"
 
 #include <fcntl.h>
+#include <inttypes.h>
 #include <libgen.h>
 #include <time.h>
 
@@ -54,41 +55,7 @@
 
 #include <android-base/macros.h>
 #include <android-base/strings.h>
-
-// For gettid.
-#if defined(__APPLE__)
-#include "AvailabilityMacros.h"  // For MAC_OS_X_VERSION_MAX_ALLOWED
-#include <stdint.h>
-#include <stdlib.h>
-#include <sys/syscall.h>
-#include <sys/time.h>
-#include <unistd.h>
-#elif defined(__linux__) && !defined(__ANDROID__)
-#include <syscall.h>
-#include <unistd.h>
-#elif defined(_WIN32)
-#include <windows.h>
-#endif
-
-#if defined(_WIN32)
-typedef uint32_t thread_id;
-#else
-typedef pid_t thread_id;
-#endif
-
-static thread_id GetThreadId() {
-#if defined(__BIONIC__)
-  return gettid();
-#elif defined(__APPLE__)
-  uint64_t tid;
-  pthread_threadid_np(NULL, &tid);
-  return tid;
-#elif defined(__linux__)
-  return syscall(__NR_gettid);
-#elif defined(_WIN32)
-  return GetCurrentThreadId();
-#endif
-}
+#include <android-base/threads.h>
 
 namespace {
 #if defined(__GLIBC__)
@@ -223,8 +190,8 @@
   static_assert(arraysize(log_characters) - 1 == FATAL + 1,
                 "Mismatch in size of log_characters and values in LogSeverity");
   char severity_char = log_characters[severity];
-  fprintf(stderr, "%s %c %s %5d %5d %s:%u] %s\n", tag ? tag : "nullptr", severity_char, timestamp,
-          getpid(), GetThreadId(), file, line, message);
+  fprintf(stderr, "%s %c %s %5d %5" PRIu64 " %s:%u] %s\n", tag ? tag : "nullptr", severity_char,
+          timestamp, getpid(), GetThreadId(), file, line, message);
 }
 
 void DefaultAborter(const char* abort_message) {
diff --git a/base/threads.cpp b/base/threads.cpp
new file mode 100644
index 0000000..a71382b
--- /dev/null
+++ b/base/threads.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/threads.h>
+
+#include <stdint.h>
+#include <unistd.h>
+
+#if defined(__APPLE__)
+#include <pthread.h>
+#elif defined(__linux__) && !defined(__ANDROID__)
+#include <syscall.h>
+#elif defined(_WIN32)
+#include <windows.h>
+#endif
+
+namespace android {
+namespace base {
+
+uint64_t GetThreadId() {
+#if defined(__BIONIC__)
+  return gettid();
+#elif defined(__APPLE__)
+  uint64_t tid;
+  pthread_threadid_np(NULL, &tid);
+  return tid;
+#elif defined(__linux__)
+  return syscall(__NR_gettid);
+#elif defined(_WIN32)
+  return GetCurrentThreadId();
+#endif
+}
+
+}  // namespace base
+}  // namespace android