diff --git a/tools/check_kconfigs.py b/tools/check_kconfigs.py
index bdc3953e4..93754b705 100755
--- a/tools/check_kconfigs.py
+++ b/tools/check_kconfigs.py
@@ -94,11 +94,12 @@ class SourceChecker(BaseChecker):
                 raise InputError(self.path_in_idf, line_number, '"source" has to been followed by space',
                                  line.replace('source', 'source '))
             path = m.group(2)
+            filename = os.path.basename(path)
             if path in ['$COMPONENT_KCONFIGS_PROJBUILD', '$COMPONENT_KCONFIGS']:
                 pass
-            elif not path.endswith('/Kconfig.in') and path != 'Kconfig.in':
-                raise InputError(self.path_in_idf, line_number, "only Kconfig.in can be sourced",
-                                 line.replace(path, os.path.join(os.path.dirname(path), 'Kconfig.in')))
+            elif not filename.startswith('Kconfig.'):
+                raise InputError(self.path_in_idf, line_number, "only filenames starting with Kconfig.* can be sourced",
+                                 line.replace(path, os.path.join(os.path.dirname(path), 'Kconfig.' + filename)))
 
 
 class LineRuleChecker(BaseChecker):
diff --git a/tools/test_check_kconfigs.py b/tools/test_check_kconfigs.py
index a38f16ab9..b8541e4a6 100755
--- a/tools/test_check_kconfigs.py
+++ b/tools/test_check_kconfigs.py
@@ -80,10 +80,10 @@ class TestSourceChecker(unittest.TestCase, ApplyLine):
         pass
 
     def test_source_file_name(self):
-        self.expect_error('source "Kconfig.test"', expect='source "Kconfig.in"')
-        self.expect_error('source "/tmp/Kconfig.test"', expect='source "/tmp/Kconfig.in"')
-        self.expect_error('source "Kconfig"', expect='source "Kconfig.in"')
+        self.expect_error('source "notKconfig.test"', expect='source "Kconfig.notKconfig.test"')
+        self.expect_error('source "Kconfig"', expect='source "Kconfig.Kconfig"')
         self.expt_success('source "Kconfig.in"')
+        self.expt_success('source "/tmp/Kconfig.test"')
         self.expt_success('source "/tmp/Kconfig.in"')
         self.expect_error('source"Kconfig.in"', expect='source "Kconfig.in"')
         self.expt_success('source "/tmp/Kconfig.in"  # comment')