diff --git a/aiidalab_qe/setup_codes.py b/aiidalab_qe/setup_codes.py
index e72cd8262..38b3e13c9 100644
--- a/aiidalab_qe/setup_codes.py
+++ b/aiidalab_qe/setup_codes.py
@@ -219,6 +219,7 @@ def _refresh_installed(self):
             self.set_trait("error", str(error))
             FN_DO_NOT_SETUP.touch()
         else:
+            self.set_trait("installed", True)
             self.set_message("OK")
         finally:
             self.set_trait("busy", False)
diff --git a/aiidalab_qe/sssp.py b/aiidalab_qe/sssp.py
index 1f6db9e74..f9a7136ee 100644
--- a/aiidalab_qe/sssp.py
+++ b/aiidalab_qe/sssp.py
@@ -102,7 +102,7 @@ def _refresh_installed(self):
             self.set_trait("error", str(error))
             self.set_message(str(error))
         else:
-            self.installed = True
+            self.set_trait("installed", True)
             self.set_message("OK")
         finally:
             self.set_trait("busy", False)