diff --git a/boa/src/builtins/number/mod.rs b/boa/src/builtins/number/mod.rs
index 3b7c10e31a..4a8ddd1dcf 100644
--- a/boa/src/builtins/number/mod.rs
+++ b/boa/src/builtins/number/mod.rs
@@ -973,10 +973,10 @@ impl Number {
             return AbstractRelation::True;
         }
         if x.is_infinite() && x.is_sign_negative() {
-            return AbstractRelation::False;
+            return AbstractRelation::True;
         }
         if y.is_infinite() && y.is_sign_negative() {
-            return AbstractRelation::True;
+            return AbstractRelation::False;
         }
         (x < y).into()
     }
diff --git a/boa/src/builtins/number/tests.rs b/boa/src/builtins/number/tests.rs
index 24760223fd..cb407b7f9c 100644
--- a/boa/src/builtins/number/tests.rs
+++ b/boa/src/builtins/number/tests.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::float_cmp)]
 
-use crate::{builtins::Number, forward, forward_val, Context};
+use crate::{builtins::Number, forward, forward_val, value::AbstractRelation, Context};
 
 #[test]
 fn integer_number_primitive_to_number_object() {
@@ -444,6 +444,34 @@ fn same_value() {
     assert_eq!(Number::equal(1.0, 1.0), true);
 }
 
+#[test]
+fn less_than() {
+    assert_eq!(
+        Number::less_than(f64::NAN, 0.0),
+        AbstractRelation::Undefined
+    );
+    assert_eq!(
+        Number::less_than(0.0, f64::NAN),
+        AbstractRelation::Undefined
+    );
+    assert_eq!(
+        Number::less_than(f64::NEG_INFINITY, 0.0),
+        AbstractRelation::True
+    );
+    assert_eq!(
+        Number::less_than(0.0, f64::NEG_INFINITY),
+        AbstractRelation::False
+    );
+    assert_eq!(
+        Number::less_than(f64::INFINITY, 0.0),
+        AbstractRelation::False
+    );
+    assert_eq!(
+        Number::less_than(0.0, f64::INFINITY),
+        AbstractRelation::True
+    );
+}
+
 #[test]
 fn same_value_zero() {
     assert_eq!(Number::same_value_zero(0.0, 0.0), true);