diff --git a/lldb/test/API/lang/c/calling-conventions/TestCCallingConventions.py b/lldb/test/API/lang/c/calling-conventions/TestCCallingConventions.py
index 9483dfcd04018..0304482e899b8 100644
--- a/lldb/test/API/lang/c/calling-conventions/TestCCallingConventions.py
+++ b/lldb/test/API/lang/c/calling-conventions/TestCCallingConventions.py
@@ -62,7 +62,10 @@ def test_stdcall(self):
             return
         self.expect_expr("func(1, 2, 3, 4)", result_type="int", result_value="10")
 
+    # Fails on x86, passes elsewhere because clang doesn't support vectorcall on
+    # any other architectures.
     @expectedFailureAll(
+        triple=re.compile("^(x86|i386)"),
         oslist=["freebsd"], bugnumber="github.com/llvm/llvm-project/issues/56084"
     )
     def test_vectorcall(self):