diff --git a/src/browser/Terminal.ts b/src/browser/Terminal.ts
index 44ea9eb0..1ab207c7 100644
--- a/src/browser/Terminal.ts
+++ b/src/browser/Terminal.ts
@@ -1194,7 +1194,7 @@ export class Terminal extends CoreTerminal implements ITerminal {
       this.buffer.lines.push(this.buffer.getBlankLine(DEFAULT_ATTR_DATA));
     }
     this.refresh(0, this.rows - 1);
-    this._onScroll.fire({position: this.buffer.ydisp, source: ScrollSource.TERMINAL });
+    this._onScroll.fire({ position: this.buffer.ydisp, source: ScrollSource.TERMINAL });
   }
 
   /**
diff --git a/src/common/CoreTerminal.ts b/src/common/CoreTerminal.ts
index 253cd4c1..50a43bf1 100644
--- a/src/common/CoreTerminal.ts
+++ b/src/common/CoreTerminal.ts
@@ -224,7 +224,7 @@ export abstract class CoreTerminal extends Disposable implements ICoreTerminal {
     // Flag rows that need updating
     this._dirtyRowService.markRangeDirty(buffer.scrollTop, buffer.scrollBottom);
 
-    this._onScroll.fire({position: buffer.ydisp, source: ScrollSource.TERMINAL});
+    this._onScroll.fire({ position: buffer.ydisp, source: ScrollSource.TERMINAL });
   }
 
   /**
@@ -254,7 +254,7 @@ export abstract class CoreTerminal extends Disposable implements ICoreTerminal {
     }
 
     if (!suppressScrollEvent) {
-      this._onScroll.fire({position: buffer.ydisp, source});
+      this._onScroll.fire({ position: buffer.ydisp, source });
     }
   }