diff --git a/crates/oxc_minifier/src/ast_passes/peephole_fold_constants.rs b/crates/oxc_minifier/src/ast_passes/peephole_fold_constants.rs
index 0d84b82ce2754..b48b91fbc4afc 100644
--- a/crates/oxc_minifier/src/ast_passes/peephole_fold_constants.rs
+++ b/crates/oxc_minifier/src/ast_passes/peephole_fold_constants.rs
@@ -1057,7 +1057,6 @@ mod test {
     }
 
     #[test]
-    #[ignore]
     fn test_string_string_comparison() {
         test("'a' < 'b'", "true");
         test("'a' <= 'b'", "true");
@@ -1123,7 +1122,6 @@ mod test {
     }
 
     #[test]
-    #[ignore]
     fn test_bigint_number_comparison() {
         test("1n < 2", "true");
         test("1n > 2", "false");
@@ -1168,7 +1166,6 @@ mod test {
     }
 
     #[test]
-    #[ignore]
     fn test_bigint_string_comparison() {
         test("1n < '2'", "true");
         test("2n > '1'", "true");
@@ -1181,7 +1178,6 @@ mod test {
     }
 
     #[test]
-    #[ignore]
     fn test_string_bigint_comparison() {
         test("'1' < 2n", "true");
         test("'2' > 1n", "true");
@@ -1199,10 +1195,10 @@ mod test {
         test("NaN <= 1", "false");
         test("NaN > 1", "false");
         test("NaN >= 1", "false");
-        // test("NaN < 1n", "false");
-        // test("NaN <= 1n", "false");
-        // test("NaN > 1n", "false");
-        // test("NaN >= 1n", "false");
+        test("NaN < 1n", "false");
+        test("NaN <= 1n", "false");
+        test("NaN > 1n", "false");
+        test("NaN >= 1n", "false");
 
         test("NaN < NaN", "false");
         test("NaN >= NaN", "false");
diff --git a/crates/oxc_minifier/src/node_util/mod.rs b/crates/oxc_minifier/src/node_util/mod.rs
index 8c682de72e00c..3f00c72aa10f8 100644
--- a/crates/oxc_minifier/src/node_util/mod.rs
+++ b/crates/oxc_minifier/src/node_util/mod.rs
@@ -272,9 +272,11 @@ pub trait NodeUtil {
                     None
                 }
             }
-            Expression::BigIntLiteral(_bigint_literal) => {
-                // TODO: evaluate the bigint value
-                None
+            Expression::BigIntLiteral(bigint_literal) => {
+                let value =
+                    self.get_string_bigint_value(bigint_literal.raw.as_str().trim_end_matches('n'));
+                debug_assert!(value.is_some(), "Failed to parse {}", bigint_literal.raw);
+                value
             }
             Expression::BooleanLiteral(bool_literal) => {
                 if bool_literal.value {