diff --git a/src/nouveau/compiler/nak/hw_tests.rs b/src/nouveau/compiler/nak/hw_tests.rs
index dcf5afe82da..0794d530ade 100644
--- a/src/nouveau/compiler/nak/hw_tests.rs
+++ b/src/nouveau/compiler/nak/hw_tests.rs
@@ -740,6 +740,39 @@ fn test_iadd64() {
     }
 }
 
+#[test]
+fn test_ineg64() {
+    let run = RunSingleton::get();
+    let invocations = 100;
+
+    let mut b = TestShaderBuilder::new(run.sm.as_ref());
+
+    let x = SSARef::from([
+        b.ld_test_data(0, MemType::B32)[0],
+        b.ld_test_data(4, MemType::B32)[0],
+    ]);
+    let dst = b.ineg64(x.into());
+    b.st_test_data(8, MemType::B32, dst[0].into());
+    b.st_test_data(12, MemType::B32, dst[1].into());
+
+    let bin = b.compile();
+
+    let mut a = Acorn::new();
+    let mut data = Vec::new();
+    for _ in 0..invocations {
+        data.push([a.get_u32(), a.get_u32(), 0, 0]);
+    }
+
+    run.run.run(&bin, &mut data).unwrap();
+
+    for d in &data {
+        let x = u64::from(d[0]) | (u64::from(d[1]) << 32);
+        let dst = -(x as i64) as u64;
+        assert_eq!(d[2], dst as u32);
+        assert_eq!(d[3], (dst >> 32) as u32);
+    }
+}
+
 #[test]
 fn test_isetp64() {
     let run = RunSingleton::get();