diff --git a/parsers/src/avatar.rs b/parsers/src/avatar.rs
index 8aef7c87..65ef22f7 100644
--- a/parsers/src/avatar.rs
+++ b/parsers/src/avatar.rs
@@ -66,7 +66,7 @@ mod tests {
     #[test]
     fn test_size() {
         assert_size!(Metadata, 12);
-        assert_size!(Info, 64);
+        assert_size!(Info, 60);
         assert_size!(Data, 12);
     }
 
@@ -74,7 +74,7 @@ mod tests {
     #[test]
     fn test_size() {
         assert_size!(Metadata, 24);
-        assert_size!(Info, 120);
+        assert_size!(Info, 112);
         assert_size!(Data, 24);
     }
 
diff --git a/parsers/src/bob.rs b/parsers/src/bob.rs
index 79c4de5b..9639bf50 100644
--- a/parsers/src/bob.rs
+++ b/parsers/src/bob.rs
@@ -93,15 +93,15 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(ContentId, 28);
-        assert_size!(Data, 60);
+        assert_size!(ContentId, 24);
+        assert_size!(Data, 56);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
-        assert_size!(ContentId, 56);
-        assert_size!(Data, 120);
+        assert_size!(ContentId, 48);
+        assert_size!(Data, 112);
     }
 
     #[test]
diff --git a/parsers/src/caps.rs b/parsers/src/caps.rs
index d3990b4e..2d1e3c7c 100644
--- a/parsers/src/caps.rs
+++ b/parsers/src/caps.rs
@@ -222,13 +222,13 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(Caps, 52);
+        assert_size!(Caps, 48);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
-        assert_size!(Caps, 104);
+        assert_size!(Caps, 96);
     }
 
     #[test]
diff --git a/parsers/src/hashes.rs b/parsers/src/hashes.rs
index b899b4a0..c79a71dd 100644
--- a/parsers/src/hashes.rs
+++ b/parsers/src/hashes.rs
@@ -209,15 +209,15 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(Algo, 16);
-        assert_size!(Hash, 28);
+        assert_size!(Algo, 12);
+        assert_size!(Hash, 24);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
-        assert_size!(Algo, 32);
-        assert_size!(Hash, 56);
+        assert_size!(Algo, 24);
+        assert_size!(Hash, 48);
     }
 
     #[test]
diff --git a/parsers/src/jingle.rs b/parsers/src/jingle.rs
index bddc3c52..f8e8fdc4 100644
--- a/parsers/src/jingle.rs
+++ b/parsers/src/jingle.rs
@@ -688,7 +688,7 @@ mod tests {
         assert_size!(Senders, 1);
         assert_size!(Disposition, 1);
         assert_size!(ContentId, 12);
-        assert_size!(Content, 220);
+        assert_size!(Content, 216);
         assert_size!(Reason, 1);
         assert_size!(ReasonElement, 16);
         assert_size!(SessionId, 12);
diff --git a/parsers/src/jingle_dtls_srtp.rs b/parsers/src/jingle_dtls_srtp.rs
index dcf19247..1101b4eb 100644
--- a/parsers/src/jingle_dtls_srtp.rs
+++ b/parsers/src/jingle_dtls_srtp.rs
@@ -78,14 +78,14 @@ mod tests {
     #[test]
     fn test_size() {
         assert_size!(Setup, 1);
-        assert_size!(Fingerprint, 32);
+        assert_size!(Fingerprint, 28);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
         assert_size!(Setup, 1);
-        assert_size!(Fingerprint, 64);
+        assert_size!(Fingerprint, 56);
     }
 
     #[test]
diff --git a/parsers/src/jingle_ice_udp.rs b/parsers/src/jingle_ice_udp.rs
index f464288b..683107f1 100644
--- a/parsers/src/jingle_ice_udp.rs
+++ b/parsers/src/jingle_ice_udp.rs
@@ -118,7 +118,7 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(Transport, 68);
+        assert_size!(Transport, 64);
         assert_size!(Type, 1);
         assert_size!(Candidate, 88);
     }
@@ -126,7 +126,7 @@ mod tests {
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
-        assert_size!(Transport, 136);
+        assert_size!(Transport, 128);
         assert_size!(Type, 1);
         assert_size!(Candidate, 128);
     }
diff --git a/parsers/src/jingle_message.rs b/parsers/src/jingle_message.rs
index c32da472..2206773b 100644
--- a/parsers/src/jingle_message.rs
+++ b/parsers/src/jingle_message.rs
@@ -109,13 +109,13 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(JingleMI, 76);
+        assert_size!(JingleMI, 72);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
-        assert_size!(JingleMI, 152);
+        assert_size!(JingleMI, 144);
     }
 
     #[test]
diff --git a/parsers/src/xhtml.rs b/parsers/src/xhtml.rs
index dcd259f6..f89b4e2d 100644
--- a/parsers/src/xhtml.rs
+++ b/parsers/src/xhtml.rs
@@ -504,16 +504,16 @@ mod tests {
     #[test]
     fn test_size() {
         assert_size!(XhtmlIm, 32);
-        assert_size!(Child, 52);
-        assert_size!(Tag, 52);
+        assert_size!(Child, 48);
+        assert_size!(Tag, 48);
     }
 
     #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
         assert_size!(XhtmlIm, 48);
-        assert_size!(Child, 104);
-        assert_size!(Tag, 104);
+        assert_size!(Child, 96);
+        assert_size!(Tag, 96);
     }
 
     #[test]