diff --git a/src/event_id.rs b/src/event_id.rs
index 606e68c2..022449f9 100644
--- a/src/event_id.rs
+++ b/src/event_id.rs
@@ -376,7 +376,7 @@ mod tests {
     #[test]
     fn invalid_event_id_host() {
         assert_eq!(
-            EventId::try_from("$39hvsi03hlne:-").err().unwrap(),
+            EventId::try_from("$39hvsi03hlne:/").err().unwrap(),
             Error::InvalidHost
         );
     }
diff --git a/src/room_alias_id.rs b/src/room_alias_id.rs
index 1d6c1de4..52cd06f4 100644
--- a/src/room_alias_id.rs
+++ b/src/room_alias_id.rs
@@ -213,7 +213,7 @@ mod tests {
     #[test]
     fn invalid_room_alias_id_host() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:-").err().unwrap(),
+            RoomAliasId::try_from("#ruma:/").err().unwrap(),
             Error::InvalidHost
         );
     }
diff --git a/src/room_id.rs b/src/room_id.rs
index 8aec0959..c28dbe05 100644
--- a/src/room_id.rs
+++ b/src/room_id.rs
@@ -231,7 +231,7 @@ mod tests {
     #[test]
     fn invalid_room_id_host() {
         assert_eq!(
-            RoomId::try_from("!29fhd83h92h0:-").err().unwrap(),
+            RoomId::try_from("!29fhd83h92h0:/").err().unwrap(),
             Error::InvalidHost
         );
     }
diff --git a/src/user_id.rs b/src/user_id.rs
index 140341ce..5297ae79 100644
--- a/src/user_id.rs
+++ b/src/user_id.rs
@@ -262,7 +262,7 @@ mod tests {
     #[test]
     fn invalid_user_id_host() {
         assert_eq!(
-            UserId::try_from("@carl:-").err().unwrap(),
+            UserId::try_from("@carl:/").err().unwrap(),
             Error::InvalidHost
         );
     }