diff --git a/addons/xterm-addon-serialize/src/SerializeAddon.ts b/addons/xterm-addon-serialize/src/SerializeAddon.ts
index 3113777e..2363e326 100644
--- a/addons/xterm-addon-serialize/src/SerializeAddon.ts
+++ b/addons/xterm-addon-serialize/src/SerializeAddon.ts
@@ -320,10 +320,11 @@ export class SerializeAddon implements ITerminalAddon {
     this._terminal = terminal;
   }
 
-  private _getString(buffer: IBuffer, rows?: number, option?: ISerializeOptions): string {
+  private _getString(buffer: IBuffer, scrollback?: number, option?: ISerializeOptions): string {
     const maxRows = buffer.length;
     const handler = new StringSerializeHandler(buffer, this._terminal!, option);
-    const correctRows = (rows === undefined) ? maxRows : constrain(rows, 0, maxRows);
+
+    const correctRows = (scrollback === undefined) ? maxRows : constrain(scrollback + this!._terminal!.rows, 0, maxRows);
     const result = handler.serialize(maxRows - correctRows, maxRows);
 
     return result;
@@ -366,7 +367,7 @@ export class SerializeAddon implements ITerminalAddon {
     };
   }
 
-  public serialize(rows?: number, options: ISerializeOptions = {}): string {
+  public serialize(scrollback?: number, options: ISerializeOptions = {}): string {
     // TODO: Add word wrap mode support
     // TODO: Add combinedData support
     if (!this._terminal) {
@@ -374,11 +375,12 @@ export class SerializeAddon implements ITerminalAddon {
     }
 
     if (this._terminal.buffer.active.type === 'normal' || !(options.withAlternate ?? true)) {
-      return this._getString(this._terminal.buffer.active, rows, options);
+      return this._getString(this._terminal.buffer.active, scrollback, options);
     }
 
-    const normalScreenContent = this._getString(this._terminal.buffer.normal, rows, options);
-    const alternativeScreenContent = this._getString(this._terminal.buffer.alternate, rows, options);
+    const normalScreenContent = this._getString(this._terminal.buffer.normal, scrollback, options);
+    // alt screen don't have scrollback
+    const alternativeScreenContent = this._getString(this._terminal.buffer.alternate, undefined, options);
 
     return normalScreenContent
       + '\u001b[?1049h\u001b[H'
diff --git a/addons/xterm-addon-serialize/test/SerializeAddon.api.ts b/addons/xterm-addon-serialize/test/SerializeAddon.api.ts
index a63e386b..0401953d 100644
--- a/addons/xterm-addon-serialize/test/SerializeAddon.api.ts
+++ b/addons/xterm-addon-serialize/test/SerializeAddon.api.ts
@@ -39,7 +39,7 @@ describe('SerializeAddon', () => {
     assert.equal(await page.evaluate(`serializeAddon.serialize();`), '');
   });
 
-  it('trim last empty lines', async function(): Promise<any> {
+  it('preserve last empty lines', async function(): Promise<any> {
     const cols = 10;
     const lines = [
       '',
@@ -55,7 +55,7 @@ describe('SerializeAddon', () => {
       ''
     ];
     await writeSync(page, lines.join('\\r\\n'));
-    assert.equal(await page.evaluate(`serializeAddon.serialize();`), lines.slice(0, 8).join('\r\n'));
+    assert.equal(await page.evaluate(`serializeAddon.serialize();`), lines.join('\r\n'));
   });
 
   it('digits content', async function(): Promise<any> {
@@ -67,21 +67,22 @@ describe('SerializeAddon', () => {
     assert.equal(await page.evaluate(`serializeAddon.serialize();`), lines.join('\r\n'));
   });
 
-  it('serialize half rows of content', async function(): Promise<any> {
-    const rows = 10;
-    const halfRows = rows >> 1;
+  it('serialize with half of scrollback', async function(): Promise<any> {
+    const rows = 20;
+    const scrollback = rows - 10;
+    const halfScrollback = scrollback / 2;
     const cols = 10;
     const lines = newArray<string>((index: number) => digitsString(cols, index), rows);
     await writeSync(page, lines.join('\\r\\n'));
-    assert.equal(await page.evaluate(`serializeAddon.serialize(${halfRows});`), lines.slice(halfRows, 2 * halfRows).join('\r\n'));
+    assert.equal(await page.evaluate(`serializeAddon.serialize(${halfScrollback});`), lines.slice(halfScrollback, rows).join('\r\n'));
   });
 
-  it('serialize 0 rows of content', async function(): Promise<any> {
-    const rows = 10;
+  it('serialize 0 rows of scrollback', async function(): Promise<any> {
+    const rows = 20;
     const cols = 10;
     const lines = newArray<string>((index: number) => digitsString(cols, index), rows);
     await writeSync(page, lines.join('\\r\\n'));
-    assert.equal(await page.evaluate(`serializeAddon.serialize(0);`), '');
+    assert.equal(await page.evaluate(`serializeAddon.serialize(0);`), lines.slice(rows - 10, rows).join('\r\n'));
   });
 
   it('serialize all rows of content with color16', async function(): Promise<any> {