diff --git a/src/imap.rs b/src/imap.rs
index 52458cdcc..9a3332146 100644
--- a/src/imap.rs
+++ b/src/imap.rs
@@ -1262,11 +1262,11 @@ impl Imap {
         }
     }
 
-    pub fn set_seen<S: AsRef<str>>(&self, context: &Context, folder: S, uid: u32) -> usize {
-        let mut res = DC_RETRY_LATER;
+    pub fn set_seen<S: AsRef<str>>(&self, context: &Context, folder: S, uid: u32) -> ImapResult {
+        let mut res = ImapResult::RetryLater;
 
         if uid == 0 {
-            res = DC_FAILED
+            res = ImapResult::Failed
         } else if self.is_connected() {
             info!(
                 context,
@@ -1284,15 +1284,15 @@ impl Imap {
             } else if self.add_flag(context, uid, "\\Seen") == 0 {
                 warn!(context, "Cannot mark message as seen.",);
             } else {
-                res = DC_SUCCESS
+                res = ImapResult::Success
             }
         }
 
-        if res == DC_RETRY_LATER {
+        if res == ImapResult::RetryLater {
             if self.should_reconnect() {
-                DC_RETRY_LATER
+                ImapResult::RetryLater
             } else {
-                DC_FAILED
+                ImapResult::Failed
             }
         } else {
             res
diff --git a/src/job.rs b/src/job.rs
index 6b570fa0d..cfbb9b13b 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -332,9 +332,9 @@ impl Job {
         if ok_to_continue {
             if let Ok(msg) = dc_msg_load_from_db(context, self.foreign_id) {
                 let server_folder = msg.server_folder.as_ref().unwrap();
-                match inbox.set_seen(context, server_folder, msg.server_uid) as libc::c_uint {
-                    0 => {}
-                    1 => {
+                match inbox.set_seen(context, server_folder, msg.server_uid) {
+                    ImapResult::Failed => {}
+                    ImapResult::RetryLater => {
                         self.try_again_later(3i32, None);
                     }
                     _ => {
@@ -387,7 +387,7 @@ impl Job {
             ok_to_continue = true;
         }
         if ok_to_continue {
-            if inbox.set_seen(context, &folder, uid) == 0 {
+            if inbox.set_seen(context, &folder, uid) == ImapResult::Failed {
                 self.try_again_later(3i32, None);
             }
             if 0 != self.param.get_int(Param::AlsoMove).unwrap_or_default() {