diff --git a/build/run_tests.py b/build/run_tests.py
index fcd346f9e..a85e93891 100755
--- a/build/run_tests.py
+++ b/build/run_tests.py
@@ -79,7 +79,7 @@ def _BinaryDirTargetOS(binary_dir):
                                  text=True)
         value = popen.communicate()[0]
         if popen.returncode == 0:
-            match = re.match('target_os = "(.*)"$', value)
+            match = re.match(r'target_os = "(.*)"$', value)
             if match:
                 return match.group(1)
 
@@ -89,7 +89,7 @@ def _BinaryDirTargetOS(binary_dir):
     if os.path.exists(build_ninja_path):
         with open(build_ninja_path) as build_ninja_file:
             build_ninja_content = build_ninja_file.read()
-            match = re.search('-linux-android(eabi)?-ar$', build_ninja_content,
+            match = re.search(r'-linux-android(eabi)?-ar$', build_ninja_content,
                               re.MULTILINE)
             if match:
                 return 'android'
@@ -197,7 +197,7 @@ def _adb_shell(command_args, env={}):
                                  stdout=subprocess.PIPE,
                                  text=True)
 
-        FINAL_LINE_RE = re.compile('status=(\d+)$')
+        FINAL_LINE_RE = re.compile(r'status=(\d+)$')
         final_line = None
         while True:
             # Use readline so that the test output appears “live” when running.
@@ -438,7 +438,7 @@ def main(args):
             for line in adb_devices.splitlines():
                 line = line
                 if (line == 'List of devices attached' or
-                        re.match('^\* daemon .+ \*$', line) or line == ''):
+                        re.match(r'^\* daemon .+ \*$', line) or line == ''):
                     continue
                 (device, ignore) = line.split('\t')
                 devices.append(device)