diff --git a/src/bob.rs b/src/bob.rs
index 704ed0c9..edb0c891 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 a68909eb..7ed5ca7a 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 d151f6c0..ba8c9d84 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);