diff --git a/artiq/test/lit/embedding/syscall_flags.py b/artiq/test/lit/embedding/syscall_flags.py
index 15636507f..7d2a10341 100644
--- a/artiq/test/lit/embedding/syscall_flags.py
+++ b/artiq/test/lit/embedding/syscall_flags.py
@@ -4,7 +4,7 @@
 from artiq.language.core import *
 from artiq.language.types import *
 
-# CHECK: call void @foo\(\), !dbg !\d+, !tbaa !\d+
+# CHECK: call void @foo\(\)(, !dbg !\d+)?, !tbaa !\d+
 
 # CHECK-L: ; Function Attrs: nounwind
 # CHECK-NEXT-L: declare void @foo()