diff --git a/crates/swc/src/lib.rs b/crates/swc/src/lib.rs
index b297ed270e2..d0a70b8e768 100644
--- a/crates/swc/src/lib.rs
+++ b/crates/swc/src/lib.rs
@@ -309,7 +309,15 @@ impl Compiler {
             let read_sourcemap = || -> Result<Option<sourcemap::SourceMap>, Error> {
                 let s = "sourceMappingURL=";
                 let idx = fm.src.rfind(s);
-                let data_url = idx.map(|idx| &fm.src[idx + s.len()..]);
+
+                let data_url = idx.map(|idx| {
+                    let data_idx = idx + s.len();
+                    if let Some(end) = fm.src[data_idx..].find('\n').map(|i| i + data_idx + 1) {
+                        &fm.src[data_idx..end]
+                    } else {
+                        &fm.src[data_idx..]
+                    }
+                });
 
                 match read_inline_sourcemap(data_url) {
                     Ok(r) => Ok(r),
diff --git a/crates/swc/tests/source_map.rs b/crates/swc/tests/source_map.rs
index 4770b24c34e..b275d64bfad 100644
--- a/crates/swc/tests/source_map.rs
+++ b/crates/swc/tests/source_map.rs
@@ -74,6 +74,11 @@ fn case_inline() {
     inline("tests/srcmap/case-inline/index.js");
 }
 
+#[test]
+fn case_inline_extra_content() {
+    inline("tests/srcmap/case-inline-extra-content/index.js");
+}
+
 #[test]
 fn issue_622() {
     file("tests/srcmap/issue-622/index.js", Default::default()).unwrap();
diff --git a/crates/swc/tests/srcmap/case-inline-extra-content/.swcrc b/crates/swc/tests/srcmap/case-inline-extra-content/.swcrc
new file mode 100644
index 00000000000..8a045416438
--- /dev/null
+++ b/crates/swc/tests/srcmap/case-inline-extra-content/.swcrc
@@ -0,0 +1,3 @@
+{
+    "inputSourceMap": true,
+}
\ No newline at end of file
diff --git a/crates/swc/tests/srcmap/case-inline-extra-content/index.js b/crates/swc/tests/srcmap/case-inline-extra-content/index.js
new file mode 100644
index 00000000000..69fff8bf17c
--- /dev/null
+++ b/crates/swc/tests/srcmap/case-inline-extra-content/index.js
@@ -0,0 +1,27 @@
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = function (d, b) {
+        extendStatics = Object.setPrototypeOf ||
+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+        return extendStatics(d, b);
+    };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+var Foo = /** @class */ (function () {
+    function Foo() {
+    }
+    return Foo;
+}());
+var Bar = /** @class */ (function (_super) {
+    __extends(Bar, _super);
+    function Bar() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    return Bar;
+}(Foo));
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5kZXguanMiLCJzb3VyY2VSb290IjoiIiwic291cmNlcyI6WyJpbmRleC50cyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiOzs7Ozs7Ozs7Ozs7O0FBQUE7SUFBQTtJQUVBLENBQUM7SUFBRCxVQUFDO0FBQUQsQ0FBQyxBQUZELElBRUM7QUFFRDtJQUFrQix1QkFBRztJQUFyQjs7SUFFQSxDQUFDO0lBQUQsVUFBQztBQUFELENBQUMsQUFGRCxDQUFrQixHQUFHLEdBRXBCIn0=
+// extra content
\ No newline at end of file