diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index e1f289a..3e890c7 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -1260,10 +1260,10 @@
     fb_queue_command("flashing unlock_bootloader", "unlocking bootloader");
 }
 
-static void do_oem_command(std::vector<std::string>* args) {
+static void do_oem_command(const std::string& cmd, std::vector<std::string>* args) {
     if (args->empty()) syntax_error("empty oem command");
 
-    std::string command("oem");
+    std::string command(cmd);
     while (!args->empty()) {
         command += " " + next_arg(args);
     }
@@ -1766,7 +1766,7 @@
             std::string filename = next_arg(&args);
             fb_queue_upload(filename.c_str());
         } else if (command == "oem") {
-            do_oem_command(&args);
+            do_oem_command("oem", &args);
         } else if (command == "flashing") {
             if (args.empty()) {
                 syntax_error("missing 'flashing' command");
@@ -1776,7 +1776,7 @@
                                             args[0] == "get_unlock_ability" ||
                                             args[0] == "get_unlock_bootloader_nonce" ||
                                             args[0] == "lock_bootloader")) {
-                do_oem_command(&args);
+                do_oem_command("flashing", &args);
             } else if (args.size() == 2 && args[0] == "unlock_bootloader") {
                 do_bypass_unlock_command(&args);
             } else {
diff --git a/libcutils/ashmem-dev.c b/libcutils/ashmem-dev.c
index 92717c0..b4abb79 100644
--- a/libcutils/ashmem-dev.c
+++ b/libcutils/ashmem-dev.c
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <unistd.h>
 
diff --git a/libmetricslogger/Android.bp b/libmetricslogger/Android.bp
index 75eab66..da8afe1 100644
--- a/libmetricslogger/Android.bp
+++ b/libmetricslogger/Android.bp
@@ -22,7 +22,7 @@
 
         // 524291 corresponds to sysui_histogram, from
         // frameworks/base/core/java/com/android/internal/logging/EventLogTags.logtags
-        "-DHISTOGRAM_LOG_TAG=524291",
+        "-DHISTOGRAM_LOG_TAG=524292",
     ],
 }
 
diff --git a/libmetricslogger/include/metricslogger/metrics_logger.h b/libmetricslogger/include/metricslogger/metrics_logger.h
index d30e56c..26aa189 100644
--- a/libmetricslogger/include/metricslogger/metrics_logger.h
+++ b/libmetricslogger/include/metricslogger/metrics_logger.h
@@ -24,5 +24,14 @@
 // buffer.
 void LogHistogram(const std::string& event, int32_t data);
 
+// TODO: replace these with the metric_logger.proto definitions
+enum {
+  LOGBUILDER_CATEGORY = 757,
+  LOGBUILDER_NAME = 799,
+  LOGBUILDER_BUCKET = 801,
+  LOGBUILDER_VALUE = 802,
+  LOGBUILDER_HISTOGRAM = 804,
+};
+
 }  // namespace metricslogger
 }  // namespace android
diff --git a/libmetricslogger/metrics_logger.cpp b/libmetricslogger/metrics_logger.cpp
index f8e0174..0d08f5c 100644
--- a/libmetricslogger/metrics_logger.cpp
+++ b/libmetricslogger/metrics_logger.cpp
@@ -23,9 +23,14 @@
 namespace android {
 namespace metricslogger {
 
+// Mirror com.android.internal.logging.MetricsLogger#histogram().
 void LogHistogram(const std::string& event, int32_t data) {
   android_log_event_list log(HISTOGRAM_LOG_TAG);
-  log << event << data << LOG_ID_EVENTS;
+  log << LOGBUILDER_CATEGORY << LOGBUILDER_HISTOGRAM
+      << LOGBUILDER_NAME << event
+      << LOGBUILDER_BUCKET << data
+      << LOGBUILDER_VALUE << 1
+      << LOG_ID_EVENTS;
 }
 
 }  // namespace metricslogger