diff --git a/cosmic-comp-config/Cargo.toml b/cosmic-comp-config/Cargo.toml
index a964efa3..219ff4d1 100644
--- a/cosmic-comp-config/Cargo.toml
+++ b/cosmic-comp-config/Cargo.toml
@@ -16,6 +16,6 @@ tracing = { version = "0.1.44", features = [
 ], optional = true }
 
 [features]
-default = []
+default = ["output", "randr"]
 output = ["ron", "tracing"]
 randr = ["cosmic-randr-shell", "output"]
diff --git a/cosmic-comp-config/src/output/randr.rs b/cosmic-comp-config/src/output/randr.rs
index dd6cb6c6..ac0aa0b7 100644
--- a/cosmic-comp-config/src/output/randr.rs
+++ b/cosmic-comp-config/src/output/randr.rs
@@ -74,6 +74,7 @@ impl From<CompList> for cosmic_randr_shell::List {
                 // XXX no physical output size in the config
                 physical: (0, 0),
                 adaptive_sync_availability: None,
+                serial_number: String::new(),
             });
         }