diff --git a/NEWS b/NEWS
index 7b07fe5f4..6ee552cc5 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,8 @@
 1.2.1.dev0
  * Skip before/after backup hooks when only doing --prune, --check, --list, and/or --info.
  * #38, #76: Upgrade ruamel.yaml compatibility version range and fix support for Python 3.7.
+ * #77: Skip non-"*.yaml" config filenames in /etc/borgmatic.d/ so as not to parse backup files,
+   editor swap files, etc.
 
 1.2.0
  * #61: Support for Borg --list option via borgmatic command-line to list all archives.
diff --git a/borgmatic/config/collect.py b/borgmatic/config/collect.py
index 02ccc9dc5..47f0ef46e 100644
--- a/borgmatic/config/collect.py
+++ b/borgmatic/config/collect.py
@@ -12,7 +12,8 @@ def collect_config_filenames(config_paths):
     '''
     Given a sequence of config paths, both filenames and directories, resolve that to just an
     iterable of files. Accomplish this by listing any given directories looking for contained config
-    files. This is non-recursive, so any directories within the given directories are ignored.
+    files (ending with the ".yaml" extension). This is non-recursive, so any directories within the
+    given directories are ignored.
 
     Return paths even if they don't exist on disk, so the user can find out about missing
     configuration paths. However, skip a default config path if it's missing, so the user doesn't
@@ -32,5 +33,5 @@ def collect_config_filenames(config_paths):
 
         for filename in os.listdir(path):
             full_filename = os.path.join(path, filename)
-            if not os.path.isdir(full_filename):
+            if full_filename.endswith('.yaml') and not os.path.isdir(full_filename):
                 yield full_filename
diff --git a/borgmatic/config/validate.py b/borgmatic/config/validate.py
index 795a07dd6..bdbbbf782 100644
--- a/borgmatic/config/validate.py
+++ b/borgmatic/config/validate.py
@@ -10,6 +10,7 @@ from ruamel import yaml
 
 logger = logging.getLogger(__name__)
 
+
 def schema_filename():
     '''
     Path to the installed YAML configuration schema file, used to validate and parse the
diff --git a/borgmatic/tests/unit/config/test_collect.py b/borgmatic/tests/unit/config/test_collect.py
index 65acbf8ee..d573ae018 100644
--- a/borgmatic/tests/unit/config/test_collect.py
+++ b/borgmatic/tests/unit/config/test_collect.py
@@ -32,6 +32,21 @@ def test_collect_config_filenames_collects_files_from_given_directories_and_igno
     )
 
 
+def test_collect_config_filenames_collects_files_from_given_directories_and_ignores_non_yaml_filenames():
+    config_paths = ('/etc/borgmatic.d',)
+    mock_path = flexmock(module.os.path)
+    mock_path.should_receive('exists').and_return(True)
+    mock_path.should_receive('isdir').with_args('/etc/borgmatic.d').and_return(True)
+    mock_path.should_receive('isdir').with_args('/etc/borgmatic.d/foo.yaml').and_return(False)
+    mock_path.should_receive('isdir').with_args('/etc/borgmatic.d/bar.yaml~').and_return(False)
+    mock_path.should_receive('isdir').with_args('/etc/borgmatic.d/baz.txt').and_return(False)
+    flexmock(module.os).should_receive('listdir').and_return(['foo.yaml', 'bar.yaml~', 'baz.txt'])
+
+    config_filenames = tuple(module.collect_config_filenames(config_paths))
+
+    assert config_filenames == ('/etc/borgmatic.d/foo.yaml',)
+
+
 def test_collect_config_filenames_skips_etc_borgmatic_config_dot_yaml_if_it_does_not_exist():
     config_paths = ('config.yaml', '/etc/borgmatic/config.yaml')
     mock_path = flexmock(module.os.path)