diff --git a/src/common/buffer/AttributeData.ts b/src/common/buffer/AttributeData.ts
index 6878069a..b51f7ecb 100644
--- a/src/common/buffer/AttributeData.ts
+++ b/src/common/buffer/AttributeData.ts
@@ -149,7 +149,7 @@ export class ExtendedAttrs implements IExtendedAttrs {
 
   constructor(
     underlineStyle: UnderlineStyle = UnderlineStyle.NONE,
-    underlineColor: number = -1
+    underlineColor: number = Attributes.CM_DEFAULT
   ) {
     this.underlineStyle = underlineStyle;
     this.underlineColor = underlineColor;