diff --git a/browser/components/tabbrowser/content/tabbrowser.js b/browser/components/tabbrowser/content/tabbrowser.js
index 2674dc2bebf436529a46d45c52cb56e86b82c03f..06d30b3e33562d8eaa04522d3719728126c59a81 100644
--- a/browser/components/tabbrowser/content/tabbrowser.js
+++ b/browser/components/tabbrowser/content/tabbrowser.js
@@ -3208,6 +3208,11 @@
         ) {
           tabWasReused = true;
           tab = this.selectedTab;
+
+          if (tabData.zenWorkspace) {
+            tab.setAttribute("zen-workspace-id", tabData.zenWorkspace);
+          }
+
           if (!tabData.pinned) {
             this.unpinTab(tab);
           } else {
@@ -3257,6 +3262,10 @@
             preferredRemoteType,
           });
 
+          if (tabData.zenWorkspace) {
+            tab.setAttribute("zen-workspace-id", tabData.zenWorkspace);
+          }
+
           if (select) {
             tabToSelect = tab;
           }