diff --git a/tests/debuginfo/function-arg-initialization.rs b/tests/debuginfo/function-arg-initialization.rs
index 1a681c7721163..d9ce6ead5f2bf 100644
--- a/tests/debuginfo/function-arg-initialization.rs
+++ b/tests/debuginfo/function-arg-initialization.rs
@@ -26,9 +26,9 @@
 
 // NON IMMEDIATE ARGS
 // gdb-command:print a
-// gdbt-check:$4 = function_arg_initialization::BigStruct {a: 3, b: 4, c: 5, d: 6, e: 7, f: 8, g: 9, h: 10}
+// gdb-check:$4 = function_arg_initialization::BigStruct {a: 3, b: 4, c: 5, d: 6, e: 7, f: 8, g: 9, h: 10}
 // gdb-command:print b
-// gdbt-check:$5 = function_arg_initialization::BigStruct {a: 11, b: 12, c: 13, d: 14, e: 15, f: 16, g: 17, h: 18}
+// gdb-check:$5 = function_arg_initialization::BigStruct {a: 11, b: 12, c: 13, d: 14, e: 15, f: 16, g: 17, h: 18}
 // gdb-command:continue
 
 // BINDING
@@ -234,6 +234,9 @@ struct BigStruct {
 
 fn non_immediate_args(a: BigStruct, b: BigStruct) {
     zzz(); // #break
+
+    // FIXME(#128973): Needed to avoid `<optimized out>` prints before #128973 has been fixed.
+    std::hint::black_box(|| { let _ = (a, b);});
 }
 
 fn binding(a: i64, b: u64, c: f64) {