diff --git a/packages/mermaid/src/themes/theme-default.js b/packages/mermaid/src/themes/theme-default.js
index 068015183..c06244888 100644
--- a/packages/mermaid/src/themes/theme-default.js
+++ b/packages/mermaid/src/themes/theme-default.js
@@ -190,8 +190,7 @@ class Theme {
 
     /* Sequence Diagram variables */
 
-    // this.actorBorder = lighten(this.border1, 0.5);
-    this.actorBorder = lighten(this.border1, 23);
+    this.actorBorder = this.border1;
     this.actorBkg = this.mainBkg;
     this.labelBoxBkgColor = this.actorBkg;
     this.signalColor = this.textColor;