diff --git a/src/protocol.rs b/src/protocol.rs
index 13f1845..c41be00 100644
--- a/src/protocol.rs
+++ b/src/protocol.rs
@@ -751,8 +751,8 @@ impl<const N: usize> JulietProtocol<N> {
     ) -> Outcome<CompletedRead, OutgoingMessage> {
         // First, attempt to complete a frame.
         loop {
-            // We do not have enough data to extract a header, indicate and return.
             if buffer.len() < Header::SIZE {
+                // We do not have enough data to extract a header, indicate and return.
                 return Outcome::incomplete(Header::SIZE - buffer.len());
             }
 
diff --git a/src/protocol/multiframe.rs b/src/protocol/multiframe.rs
index a9c195e..61f51f6 100644
--- a/src/protocol/multiframe.rs
+++ b/src/protocol/multiframe.rs
@@ -212,7 +212,9 @@ impl InitialFrameData {
     /// Returns whether or not the initial frame data describes a complete initial frame.
     #[inline(always)]
     fn is_complete(self) -> bool {
-        self.segment_len >= self.payload_size as usize
+        debug_assert!(self.segment_len <= self.payload_size as usize);
+
+        self.segment_len == self.payload_size as usize
     }
 }