diff --git a/CHANGES b/CHANGES
index 28e99a44d..6a4aa6eeb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,9 @@ Dependencies
 Incompatible changes
 --------------------
 
+* Ignore filenames without file extension given to ``Builder.build_specific()``
+  API directly
+
 Deprecated
 ----------
 
diff --git a/sphinx/builders/__init__.py b/sphinx/builders/__init__.py
index 335880ef0..5cd5312fa 100644
--- a/sphinx/builders/__init__.py
+++ b/sphinx/builders/__init__.py
@@ -298,8 +298,7 @@ class Builder:
                 logger.warning(__('file %r given on command line is not under the '
                                   'source directory, ignoring'), filename)
                 continue
-            if not (path.isfile(filename) or
-                    any(path.isfile(filename + suffix) for suffix in suffixes)):
+            if not path.isfile(filename):
                 logger.warning(__('file %r given on command line does not exist, '
                                   'ignoring'), filename)
                 continue
diff --git a/tests/test_application.py b/tests/test_application.py
index 1a4d41289..08c13c5cf 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -131,7 +131,7 @@ def test_build_specific(app):
                  app.srcdir / 'subdir/../subdir/excluded.txt']  # not normalized
     app.build(False, filenames)
 
-    expected = ['index', 'images', 'img.png', 'subdir/includes', 'subdir/excluded']
+    expected = ['index', 'img.png', 'subdir/includes', 'subdir/excluded']
     app.builder.build.assert_called_with(expected,
                                          method='specific',
-                                         summary='5 source files given on command line')
+                                         summary='4 source files given on command line')