diff --git a/gclient_utils.py b/gclient_utils.py
index fcaa69a9a..f123496f4 100644
--- a/gclient_utils.py
+++ b/gclient_utils.py
@@ -1397,5 +1397,5 @@ def merge_conditions(*conditions):
         if not condition:
             condition = current_condition
             continue
-        condition = f'({condition}) AND ({current_condition})'
+        condition = f'({condition}) and ({current_condition})'
     return condition
diff --git a/tests/gclient_utils_test.py b/tests/gclient_utils_test.py
index e6157841b..978be886f 100755
--- a/tests/gclient_utils_test.py
+++ b/tests/gclient_utils_test.py
@@ -408,10 +408,10 @@ class GClientUtilsTest(trial_dir.TestCase):
 
         self.assertEqual('foo', gclient_utils.merge_conditions(None, 'foo'))
 
-        self.assertEqual('(foo) AND (bar)',
+        self.assertEqual('(foo) and (bar)',
                          gclient_utils.merge_conditions('foo', 'bar'))
 
-        self.assertEqual('(foo or bar) AND (baz)',
+        self.assertEqual('(foo or bar) and (baz)',
                          gclient_utils.merge_conditions('foo or bar', 'baz'))
 
 if __name__ == '__main__':