diff --git a/src/headless/Terminal.ts b/src/headless/Terminal.ts
index 2df76c61e..e53c00fbb 100644
--- a/src/headless/Terminal.ts
+++ b/src/headless/Terminal.ts
@@ -69,7 +69,7 @@ export class Terminal extends CoreTerminal {
     return this.buffer.markers;
   }
 
-  public addMarker(cursorYOffset: number): IMarker | undefined {
+  public registerMarker(cursorYOffset: number): IMarker | undefined {
     // Disallow markers on the alt buffer
     if (this.buffer !== this.buffers.normal) {
       return;
diff --git a/src/headless/public/Terminal.ts b/src/headless/public/Terminal.ts
index 0d4e6e93b..bf673ee08 100644
--- a/src/headless/public/Terminal.ts
+++ b/src/headless/public/Terminal.ts
@@ -141,7 +141,7 @@ export class Terminal extends Disposable implements ITerminalApi {
   }
   public registerMarker(cursorYOffset: number = 0): IMarker | undefined {
     this._verifyIntegers(cursorYOffset);
-    return this._core.addMarker(cursorYOffset);
+    return this._core.registerMarker(cursorYOffset);
   }
   public addMarker(cursorYOffset: number): IMarker | undefined {
     return this.registerMarker(cursorYOffset);