diff --git a/src/bob.rs b/src/bob.rs
index 704ed0c94ef7c692f1cea8478f353306c9affdd8..edb0c89103128ef94f5045c05c9ade37f78f9d74 100644
--- a/src/bob.rs
+++ b/src/bob.rs
@@ -95,8 +95,8 @@ mod tests {
     #[cfg(target_pointer_width = "32")]
     #[test]
     fn test_size() {
-        assert_size!(ContentId, 24);
-        assert_size!(Data, 24);
+        assert_size!(ContentId, 28);
+        assert_size!(Data, 60);
     }
 
     #[cfg(target_pointer_width = "64")]
diff --git a/src/cert_management.rs b/src/cert_management.rs
index a68909eb8b06d9c2f070b556a4737659479edd51..7ed5ca7a4f461bf90cdc9814a2667006cd428cd6 100644
--- a/src/cert_management.rs
+++ b/src/cert_management.rs
@@ -118,9 +118,32 @@ mod tests {
     use std::str::FromStr;
     use crate::ns;
 
+    #[cfg(target_pointer_width = "32")]
+    #[test]
+    fn test_size() {
+        assert_size!(Append, 28);
+        assert_size!(Disable, 12);
+        assert_size!(Revoke, 12);
+        assert_size!(ListCertsQuery, 0);
+        assert_size!(ListCertsResponse, 12);
+        assert_size!(Item, 40);
+        assert_size!(Resource, 12);
+        assert_size!(Users, 12);
+        assert_size!(Cert, 12);
+    }
+
+    #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
         assert_size!(Append, 56);
+        assert_size!(Disable, 24);
+        assert_size!(Revoke, 24);
+        assert_size!(ListCertsQuery, 0);
+        assert_size!(ListCertsResponse, 24);
+        assert_size!(Item, 80);
+        assert_size!(Resource, 24);
+        assert_size!(Users, 24);
+        assert_size!(Cert, 24);
     }
 
     #[test]
diff --git a/src/jid_prep.rs b/src/jid_prep.rs
index d151f6c04bec1d5af2e6106c3c812e8239536644..ba8c9d84e18a28a3ade067108b53765af97bc84a 100644
--- a/src/jid_prep.rs
+++ b/src/jid_prep.rs
@@ -46,6 +46,14 @@ mod tests {
     use std::convert::TryFrom;
     use std::str::FromStr;
 
+    #[cfg(target_pointer_width = "32")]
+    #[test]
+    fn test_size() {
+        assert_size!(JidPrepQuery, 12);
+        assert_size!(JidPrepResponse, 40);
+    }
+
+    #[cfg(target_pointer_width = "64")]
     #[test]
     fn test_size() {
         assert_size!(JidPrepQuery, 24);