diff --git a/tests/run-make/extern-fn-explicit-align/test.c b/tests/run-make/extern-fn-explicit-align/test.c
index 8d20864326b..a3db3442aaf 100644
--- a/tests/run-make/extern-fn-explicit-align/test.c
+++ b/tests/run-make/extern-fn-explicit-align/test.c
@@ -47,7 +47,8 @@ struct __attribute__((aligned(1))) LowerAlign
 #pragma pack(push, 1)
 struct Packed
 {
-    __uint128_t a;
+    uint64_t a;
+    uint64_t b;
 };
 #pragma pack(pop)
 
@@ -86,6 +87,7 @@ int32_t many_args(
     assert(l.b == 6);
     assert(!m);
     assert(n.a == 7);
+    assert(n.b == 8);
     assert(strcmp(o, "Hello world") == 0);
     return 0;
 }
diff --git a/tests/run-make/extern-fn-explicit-align/test.rs b/tests/run-make/extern-fn-explicit-align/test.rs
index 56c6437dad2..ad06d92ac96 100644
--- a/tests/run-make/extern-fn-explicit-align/test.rs
+++ b/tests/run-make/extern-fn-explicit-align/test.rs
@@ -38,7 +38,8 @@ pub struct LowerAlign {
 #[repr(C)]
 #[repr(packed)]
 pub struct Packed {
-    pub a: u128
+    pub a: u64,
+    pub b: u64,
 }
 
 #[link(name = "test", kind = "static")]
@@ -69,7 +70,7 @@ fn main() {
     let two_u64s = TwoU64s { a: 1, b: 2 };
     let wrapped = WrappedU64s { a: TwoU64s { a: 3, b: 4 } };
     let lower = LowerAlign { a: 5, b: 6 };
-    let packed = Packed { a: 7 };
+    let packed = Packed { a: 7, b: 8 };
     let string = STRING;
     unsafe {
         many_args(