diff --git a/check.py b/check.py
index 5c0e19ff3d9..0b5ed5ce7d6 100755
--- a/check.py
+++ b/check.py
@@ -242,9 +242,9 @@ def check_expected(actual, expected):
                 for module, asserts in support.split_wast(wast):
                     print('        testing split module', split_num)
                     split_num += 1
-                    support.write_wast('split.wast', module, asserts)
+                    support.write_wast('split.wast', module)
                     run_opt_test('split.wast')    # also that our optimizer doesn't break on it
-                    result_wast_file = shared.binary_format_check('split.wast', verify_final_result=False, original_wast=wast)
+                    result_wast_file = shared.binary_format_check('split.wast', verify_final_result=False)
                     with open(result_wast_file) as f:
                         result_wast = f.read()
                         # add the asserts, and verify that the test still passes
diff --git a/scripts/test/shared.py b/scripts/test/shared.py
index ef3cea261dc..3a9b5a26c20 100644
--- a/scripts/test/shared.py
+++ b/scripts/test/shared.py
@@ -457,7 +457,7 @@ def get_tests(test_dir, extensions=[], recursive=False):
 # check utilities
 
 def binary_format_check(wast, verify_final_result=True, wasm_as_args=['-g'],
-                        binary_suffix='.fromBinary', original_wast=None):
+                        binary_suffix='.fromBinary'):
     # checks we can convert the wast to binary and back
 
     print('         (binary format check)')