--- a/devtools/server/actors/source.js
+++ b/devtools/server/actors/source.js
@@ -216,16 +216,17 @@ let SourceActor = ActorClassWithSpec(sou
       actor: this.actorID,
       generatedUrl: this.generatedSource ? this.generatedSource.url : null,
       url: this.url ? this.url.split(" -> ").pop() : null,
       addonID: this._addonID,
       addonPath: this._addonPath,
       isBlackBoxed: this.threadActor.sources.isBlackBoxed(this.url),
       isPrettyPrinted: this.threadActor.sources.isPrettyPrinted(this.url),
       isSourceMapped: this.isSourceMapped,
+      sourceMapURL: source ? source.sourceMapURL : null,
       introductionUrl: introductionUrl ? introductionUrl.split(" -> ").pop() : null,
       introductionType: source ? source.introductionType : null
     };
   },
 
   disconnect: function () {
     if (this.registeredPool && this.registeredPool.sourceActors) {
       delete this.registeredPool.sourceActors[this.actorID];