diff --git a/src/contact.rs b/src/contact.rs
index 624404110..00f371ce7 100644
--- a/src/contact.rs
+++ b/src/contact.rs
@@ -861,14 +861,14 @@ impl Contact {
             .unwrap_or_default() as usize
     }
 
-    pub fn get_origin_by_id(context: &Context, contact_id: u32, ret_blocked: &mut i32) -> Origin {
+    pub fn get_origin_by_id(context: &Context, contact_id: u32, ret_blocked: &mut bool) -> Origin {
         let mut ret = Origin::Unknown;
-        *ret_blocked = 0;
+        *ret_blocked = false;
 
         if let Ok(contact) = Contact::load_from_db(context, contact_id) {
             /* we could optimize this by loading only the needed fields */
             if contact.blocked {
-                *ret_blocked = 1;
+                *ret_blocked = true;
             } else {
                 ret = contact.origin;
             }
diff --git a/src/dc_receive_imf.rs b/src/dc_receive_imf.rs
index 8ce267b4b..b2d8e2fd6 100644
--- a/src/dc_receive_imf.rs
+++ b/src/dc_receive_imf.rs
@@ -71,7 +71,7 @@ pub fn dc_receive_imf(
     let mut incoming_origin = Origin::Unknown;
     let mut to_self = false;
     let mut from_id = 0u32;
-    let mut from_id_blocked = 0;
+    let mut from_id_blocked = false;
     let mut to_id = 0u32;
     let mut chat_id = 0;
     let mut hidden = false;
@@ -285,7 +285,7 @@ fn add_parts(
     rfc724_mid: &str,
     sent_timestamp: &mut i64,
     from_id: &mut u32,
-    from_id_blocked: i32,
+    from_id_blocked: bool,
     hidden: &mut bool,
     chat_id: &mut u32,
     to_id: &mut u32,
@@ -677,7 +677,7 @@ fn add_parts(
     if *chat_id == DC_CHAT_ID_TRASH {
         *create_event_to_send = None;
     } else if incoming && state == MessageState::InFresh {
-        if 0 != from_id_blocked {
+        if from_id_blocked {
             *create_event_to_send = None;
         } else if Blocked::Not != chat_id_blocked {
             *create_event_to_send = Some(CreateEvent::MsgsChanged);