diff --git a/NEWS b/NEWS
index 5897df34..73b6af0d 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,8 @@
  * Add the NEWS changelog file to release tarball (#1298).
  * Enable reply by email on projects.torsion.org, so replies to notification emails get posted as
    comments on tickets.
+ * For the MariaDB and MySQL database hooks, escape quotes in passwords when the
+   "password_transport" option is "pipe".
 
 2.1.5
  * #1229: Document the permissions needed for the PostgreSQL database hook:
diff --git a/borgmatic/hooks/data_source/mariadb.py b/borgmatic/hooks/data_source/mariadb.py
index a6f744b9..352afdde 100644
--- a/borgmatic/hooks/data_source/mariadb.py
+++ b/borgmatic/hooks/data_source/mariadb.py
@@ -67,7 +67,9 @@ def make_defaults_file_options(username=None, password=None, defaults_extra_file
     Do not use the returned value for multiple different command invocations. That will not work
     because each pipe is "used up" once read.
     '''
-    escaped_password = None if password is None else password.replace('\\', '\\\\')
+    escaped_password = (
+        None if password is None else password.replace('\\', '\\\\').replace('"', '\\"')
+    )
 
     values = '\n'.join(
         (
diff --git a/tests/unit/hooks/data_source/test_mariadb.py b/tests/unit/hooks/data_source/test_mariadb.py
index 3054006c..04d4498f 100644
--- a/tests/unit/hooks/data_source/test_mariadb.py
+++ b/tests/unit/hooks/data_source/test_mariadb.py
@@ -64,6 +64,23 @@ def test_make_defaults_file_escapes_password_containing_backslash():
     )
 
 
+def test_make_defaults_file_escapes_password_containing_quote():
+    read_descriptor = 99
+    write_descriptor = flexmock()
+
+    flexmock(module.os).should_receive('pipe').and_return(read_descriptor, write_descriptor)
+    flexmock(module.os).should_receive('write').with_args(
+        write_descriptor,
+        b'[client]\nuser=root\n' + rb'password="trust\"some1"',
+    ).once()
+    flexmock(module.os).should_receive('close')
+    flexmock(module.os).should_receive('set_inheritable')
+
+    assert module.make_defaults_file_options(username='root', password=r'trust"some1') == (
+        '--defaults-extra-file=/dev/fd/99',
+    )
+
+
 def test_make_defaults_file_pipe_with_only_username_writes_it_to_file_descriptor():
     read_descriptor = 99
     write_descriptor = flexmock()