diff --git a/utils/build-presets.ini b/utils/build-presets.ini
index 9868639c98f1e..aeea82d2b579c 100644
--- a/utils/build-presets.ini
+++ b/utils/build-presets.ini
@@ -1854,6 +1854,7 @@ release
 assertions
 swiftsyntax
 swiftsyntax-enable-rawsyntax-validation
+swiftsyntax-enable-test-fuzzing
 swiftsyntax-verify-generated-files
 swiftsyntax-lint
 swiftformat
@@ -1868,6 +1869,7 @@ release
 assertions
 swiftsyntax
 swiftsyntax-enable-rawsyntax-validation
+swiftsyntax-enable-test-fuzzing
 swiftsyntax-verify-generated-files
 swiftsyntax-lint
 sourcekit-lsp
diff --git a/utils/build_swift/build_swift/driver_arguments.py b/utils/build_swift/build_swift/driver_arguments.py
index 2f9d7978bb45a..0692436f01da7 100644
--- a/utils/build_swift/build_swift/driver_arguments.py
+++ b/utils/build_swift/build_swift/driver_arguments.py
@@ -718,6 +718,10 @@ def create_argument_parser():
            toggle_true('swiftsyntax_verify_generated_files'),
            help='set to verify that the generated files in the source tree ' +
                 'match the ones that would be generated from current main')
+    option('--swiftsyntax-enable-test-fuzzing',
+           toggle_true('swiftsyntax_enable_test_fuzzing'),
+           help='set to modify test cases in SwiftParserTest to check for ' +
+                'round-trip failures and assertion failures')
     option('--swiftsyntax-enable-rawsyntax-validation',
            toggle_true('swiftsyntax_enable_rawsyntax_validation'),
            help='set to validate that RawSyntax layout nodes contain children of ' +
diff --git a/utils/build_swift/tests/expected_options.py b/utils/build_swift/tests/expected_options.py
index 7e76bc829c917..6e27397b84156 100644
--- a/utils/build_swift/tests/expected_options.py
+++ b/utils/build_swift/tests/expected_options.py
@@ -112,6 +112,7 @@
     'install_swiftdocc': False,
     'swiftsyntax_verify_generated_files': False,
     'swiftsyntax_enable_rawsyntax_validation': False,
+    'swiftsyntax_enable_test_fuzzing': False,
     'swiftsyntax_lint': False,
     'install_playgroundsupport': False,
     'install_sourcekitlsp': False,
@@ -609,6 +610,8 @@ class BuildScriptImplOption(_BaseOption):
                  dest='swiftsyntax_verify_generated_files'),
     EnableOption('--swiftsyntax-enable-rawsyntax-validation',
                  dest='swiftsyntax_enable_rawsyntax_validation'),
+    EnableOption('--swiftsyntax-enable-test-fuzzing',
+                 dest='swiftsyntax_enable_test_fuzzing'),
     EnableOption('--swiftsyntax-lint',
                  dest='swiftsyntax_lint'),
     EnableOption('--install-swiftpm', dest='install_swiftpm'),
diff --git a/utils/swift_build_support/swift_build_support/products/swiftsyntax.py b/utils/swift_build_support/swift_build_support/products/swiftsyntax.py
index 1189e358f31e6..0142abfb17071 100644
--- a/utils/swift_build_support/swift_build_support/products/swiftsyntax.py
+++ b/utils/swift_build_support/swift_build_support/products/swiftsyntax.py
@@ -66,6 +66,9 @@ def run_swiftsyntax_build_script(self, target, command, additional_params=[]):
         if self.args.swiftsyntax_enable_rawsyntax_validation:
             build_cmd.append('--enable-rawsyntax-validation')
 
+        if self.args.swiftsyntax_enable_test_fuzzing:
+            build_cmd.append('--enable-test-fuzzing')
+
         if self.args.verbose_build:
             build_cmd.append('--verbose')