diff --git a/cosmic-theme/src/output/mod.rs b/cosmic-theme/src/output/mod.rs
index 31b0f773..c265c88a 100644
--- a/cosmic-theme/src/output/mod.rs
+++ b/cosmic-theme/src/output/mod.rs
@@ -42,5 +42,8 @@ impl Theme {
 
 pub fn to_hex(c: Srgba) -> String {
     let c_u8: Rgba<palette::encoding::Srgb, u8> = c.into_format();
-    format!("{:02x}{:02x}{:02x}", c_u8.red, c_u8.green, c_u8.blue)
+    format!(
+        "{:02x}{:02x}{:02x}{:02x}",
+        c_u8.red, c_u8.green, c_u8.blue, c_u8.alpha
+    )
 }