diff --git a/src/icf/mod.rs b/src/icf/mod.rs
index 6d68518..d0fffbb 100644
--- a/src/icf/mod.rs
+++ b/src/icf/mod.rs
@@ -270,16 +270,7 @@ pub fn serialize_icf(data: &[IcfData]) -> Result<Vec<u8>> {
     let mut app_id: Option<String> = None;
 
     for container in data {
-        // I don't think there's a really good way to do this?
-        // At least, not without breaking backwards compatibility.
-        let is_prerelease = match container {
-            IcfData::System(s) => s.is_prerelease,
-            IcfData::App(a) => a.is_prerelease,
-            IcfData::Option(o) => o.is_prerelease,
-            IcfData::Patch(p) => p.is_prerelease,
-        };
-
-        if is_prerelease {
+        if container.is_prerelease() {
             icf.extend([0x01, 0x02, 0x00, 0x00]);
         } else {
             icf.extend([0x02, 0x01, 0x00, 0x00]);