diff --git a/src/test/ui/simd/simd-type-generic-monomorphisation-extern-nonnull-ptr.rs b/src/test/ui/simd/simd-type-generic-monomorphisation-extern-nonnull-ptr.rs
new file mode 100644
index 0000000000000..ae321c974b9d9
--- /dev/null
+++ b/src/test/ui/simd/simd-type-generic-monomorphisation-extern-nonnull-ptr.rs
@@ -0,0 +1,23 @@
+// run-pass
+// ignore-emscripten
+
+#![feature(extern_types)]
+#![feature(repr_simd)]
+
+use std::ptr::NonNull;
+
+extern {
+    type Extern;
+}
+
+#[repr(simd)]
+struct S<T>(T);
+
+#[inline(never)]
+fn identity<T>(v: T) -> T {
+    v
+}
+
+fn main() {
+    let _v: S<[Option<NonNull<Extern>>; 4]> = identity(S([None; 4]));
+}