diff --git a/parsers/src/jingle.rs b/parsers/src/jingle.rs
index 584abfb..664d572 100644
--- a/parsers/src/jingle.rs
+++ b/parsers/src/jingle.rs
@@ -704,7 +704,11 @@ mod tests {
         assert_size!(Senders, 1);
         assert_size!(Disposition, 1);
         assert_size!(ContentId, 24);
+        // TODO: Remove conditional
+        #[cfg(feature = "nightly")]
         assert_size!(Content, 448);
+        #[cfg(feature = "stable")]
+        assert_size!(Content, 440);
         assert_size!(Reason, 1);
         assert_size!(ReasonElement, 32);
         assert_size!(SessionId, 24);