diff --git a/install.cpp b/install.cpp
index 30fd2c6..a4c6986 100644
--- a/install.cpp
+++ b/install.cpp
@@ -49,10 +49,10 @@
 #include <ziparchive/zip_archive.h>
 
 #include "common.h"
-#include "otautil/SysUtil.h"
-#include "otautil/ThermalUtil.h"
 #include "otautil/error_code.h"
 #include "otautil/paths.h"
+#include "otautil/sysutil.h"
+#include "otautil/thermalutil.h"
 #include "private/install.h"
 #include "roots.h"
 #include "ui.h"
diff --git a/otautil/Android.bp b/otautil/Android.bp
index 572d8df..0be019c 100644
--- a/otautil/Android.bp
+++ b/otautil/Android.bp
@@ -40,10 +40,10 @@
     target: {
         android: {
             srcs: [
-                "DirUtil.cpp",
-                "SysUtil.cpp",
-                "ThermalUtil.cpp",
+                "dirutil.cpp",
                 "mounts.cpp",
+                "sysutil.cpp",
+                "thermalutil.cpp",
             ],
 
             static_libs: [
diff --git a/otautil/DirUtil.cpp b/otautil/dirutil.cpp
similarity index 98%
rename from otautil/DirUtil.cpp
rename to otautil/dirutil.cpp
index 61c8328..ae1cd5c 100644
--- a/otautil/DirUtil.cpp
+++ b/otautil/dirutil.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "otautil/DirUtil.h"
+#include "otautil/dirutil.h"
 
 #include <dirent.h>
 #include <errno.h>
diff --git a/otautil/include/otautil/DirUtil.h b/otautil/include/otautil/dirutil.h
similarity index 100%
rename from otautil/include/otautil/DirUtil.h
rename to otautil/include/otautil/dirutil.h
diff --git a/otautil/include/otautil/SysUtil.h b/otautil/include/otautil/sysutil.h
similarity index 100%
rename from otautil/include/otautil/SysUtil.h
rename to otautil/include/otautil/sysutil.h
diff --git a/otautil/include/otautil/ThermalUtil.h b/otautil/include/otautil/thermalutil.h
similarity index 100%
rename from otautil/include/otautil/ThermalUtil.h
rename to otautil/include/otautil/thermalutil.h
diff --git a/otautil/SysUtil.cpp b/otautil/sysutil.cpp
similarity index 99%
rename from otautil/SysUtil.cpp
rename to otautil/sysutil.cpp
index 48336ad..e6385c4 100644
--- a/otautil/SysUtil.cpp
+++ b/otautil/sysutil.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "otautil/SysUtil.h"
+#include "otautil/sysutil.h"
 
 #include <errno.h>  // TEMP_FAILURE_RETRY
 #include <fcntl.h>
diff --git a/otautil/ThermalUtil.cpp b/otautil/thermalutil.cpp
similarity index 98%
rename from otautil/ThermalUtil.cpp
rename to otautil/thermalutil.cpp
index 5d9bd45..4660e05 100644
--- a/otautil/ThermalUtil.cpp
+++ b/otautil/thermalutil.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "otautil/ThermalUtil.h"
+#include "otautil/thermalutil.h"
 
 #include <dirent.h>
 #include <stdio.h>
diff --git a/recovery.cpp b/recovery.cpp
index 890f99c..d8f56b8 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -67,7 +67,7 @@
 #include "fuse_sideload.h"
 #include "install.h"
 #include "minui/minui.h"
-#include "otautil/DirUtil.h"
+#include "otautil/dirutil.h"
 #include "otautil/error_code.h"
 #include "otautil/paths.h"
 #include "roots.h"
diff --git a/tests/component/updater_test.cpp b/tests/component/updater_test.cpp
index 5d3b2d9..48363a6 100644
--- a/tests/component/updater_test.cpp
+++ b/tests/component/updater_test.cpp
@@ -40,10 +40,10 @@
 
 #include "common/test_constants.h"
 #include "edify/expr.h"
-#include "otautil/SysUtil.h"
 #include "otautil/error_code.h"
 #include "otautil/paths.h"
 #include "otautil/print_sha1.h"
+#include "otautil/sysutil.h"
 #include "updater/blockimg.h"
 #include "updater/install.h"
 #include "updater/updater.h"
diff --git a/tests/component/verifier_test.cpp b/tests/component/verifier_test.cpp
index 2ef3828..3246ecd 100644
--- a/tests/component/verifier_test.cpp
+++ b/tests/component/verifier_test.cpp
@@ -16,7 +16,6 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <gtest/gtest.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
@@ -28,9 +27,10 @@
 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 #include <android-base/test_utils.h>
+#include <gtest/gtest.h>
 
 #include "common/test_constants.h"
-#include "otautil/SysUtil.h"
+#include "otautil/sysutil.h"
 #include "verifier.h"
 
 using namespace std::string_literals;
diff --git a/tests/unit/dirutil_test.cpp b/tests/unit/dirutil_test.cpp
index 7f85d13..1ca786c 100644
--- a/tests/unit/dirutil_test.cpp
+++ b/tests/unit/dirutil_test.cpp
@@ -22,7 +22,8 @@
 
 #include <android-base/test_utils.h>
 #include <gtest/gtest.h>
-#include <otautil/DirUtil.h>
+
+#include "otautil/dirutil.h"
 
 TEST(DirUtilTest, create_invalid) {
   // Requesting to create an empty dir is invalid.
diff --git a/tests/unit/sysutil_test.cpp b/tests/unit/sysutil_test.cpp
index 434ee25..19fa4c5 100644
--- a/tests/unit/sysutil_test.cpp
+++ b/tests/unit/sysutil_test.cpp
@@ -14,14 +14,13 @@
  * limitations under the License.
  */
 
-#include <gtest/gtest.h>
-
 #include <string>
 
 #include <android-base/file.h>
 #include <android-base/test_utils.h>
+#include <gtest/gtest.h>
 
-#include "otautil/SysUtil.h"
+#include "otautil/sysutil.h"
 
 TEST(SysUtilTest, InvalidArgs) {
   MemMapping mapping;
diff --git a/tests/unit/zip_test.cpp b/tests/unit/zip_test.cpp
index 8276685..47f33d9 100644
--- a/tests/unit/zip_test.cpp
+++ b/tests/unit/zip_test.cpp
@@ -23,10 +23,10 @@
 #include <android-base/file.h>
 #include <android-base/test_utils.h>
 #include <gtest/gtest.h>
-#include <otautil/SysUtil.h>
 #include <ziparchive/zip_archive.h>
 
 #include "common/test_constants.h"
+#include "otautil/sysutil.h"
 
 TEST(ZipTest, OpenFromMemory) {
   std::string zip_path = from_testdata_base("ziptest_dummy-update.zip");
diff --git a/updater/install.cpp b/updater/install.cpp
index 5623c33..b41d48c 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -58,7 +58,7 @@
 
 #include "edify/expr.h"
 #include "otafault/ota_io.h"
-#include "otautil/DirUtil.h"
+#include "otautil/dirutil.h"
 #include "otautil/error_code.h"
 #include "otautil/mounts.h"
 #include "otautil/print_sha1.h"
diff --git a/updater/updater.cpp b/updater/updater.cpp
index bf7c36c..40e3f1f 100644
--- a/updater/updater.cpp
+++ b/updater/updater.cpp
@@ -32,9 +32,9 @@
 
 #include "edify/expr.h"
 #include "otafault/config.h"
-#include "otautil/DirUtil.h"
-#include "otautil/SysUtil.h"
+#include "otautil/dirutil.h"
 #include "otautil/error_code.h"
+#include "otautil/sysutil.h"
 #include "updater/blockimg.h"
 #include "updater/install.h"