diff --git a/melib/src/mailbox/email/attachments.rs b/melib/src/mailbox/email/attachments.rs
index 165533bd..e050c72a 100644
--- a/melib/src/mailbox/email/attachments.rs
+++ b/melib/src/mailbox/email/attachments.rs
@@ -81,7 +81,7 @@ impl AttachmentBuilder {
                 }
                 assert!(boundary.is_some());
                 let _boundary = boundary.unwrap();
-                let offset = _boundary.as_ptr() as usize - value.as_ptr() as usize;
+                let offset = (_boundary.as_ptr() as usize).wrapping_sub(value.as_ptr() as usize);
                 let boundary = SliceBuild::new(offset, _boundary.len());
                 let subattachments = Self::subattachments(&self.raw, boundary.get(&value));
                 assert!(subattachments.len() > 0);
@@ -215,7 +215,7 @@ impl AttachmentBuilder {
                         }
                     };
                     let body_slice = {
-                        let offset = body.as_ptr() as usize - a.as_ptr() as usize;
+                        let offset = (body.as_ptr() as usize).wrapping_sub(a.as_ptr() as usize);
                         SliceBuild::new(offset, body.len())
                     };
                     builder.raw = body_slice.get(a).ltrim().into();
diff --git a/melib/src/mailbox/email/parser.rs b/melib/src/mailbox/email/parser.rs
index 150092fa..9a2052e6 100644
--- a/melib/src/mailbox/email/parser.rs
+++ b/melib/src/mailbox/email/parser.rs
@@ -418,7 +418,7 @@ fn group(input: &[u8]) -> IResult<&[u8], Address> {
             return IResult::Error(e);
         }
         IResult::Done(rest, vec) => {
-            let size: usize = (rest.as_ptr() as usize) - ((&input[0..] as &[u8]).as_ptr() as usize);
+            let size: usize = (rest.as_ptr() as usize).wrapping_sub((&input[0..] as &[u8]).as_ptr() as usize);
             return IResult::Done(
                 rest,
                 Address::Group(GroupAddress {