diff --git a/tests/by-util/test_factor.rs b/tests/by-util/test_factor.rs
index fac175fa0..04f7a5273 100644
--- a/tests/by-util/test_factor.rs
+++ b/tests/by-util/test_factor.rs
@@ -72,8 +72,12 @@ fn test_random() {
     run(instring.as_bytes(), outstring.as_bytes());
 }
 
+// FixME: random failures; avoid for CI until fixed; ref: GH:uutils/coreutils#1531
 #[test]
 fn test_random_big() {
+    if is_ci() {
+        return;
+    }; // skip test under CI until random failures are fixed
     let mut rng = SmallRng::from_entropy();
     let bitrange_1 = Uniform::new(14usize, 51);
     let mut rand_64 = move || {