diff --git a/crates/ruma-client-api/src/lib.rs b/crates/ruma-client-api/src/lib.rs
index cf8ff79b..f53f1d8f 100644
--- a/crates/ruma-client-api/src/lib.rs
+++ b/crates/ruma-client-api/src/lib.rs
@@ -13,11 +13,19 @@ pub mod r0;
 pub mod session;
 pub mod unversioned;
 
+use std::fmt;
+
 pub use error::Error;
 
 // Wrapper around `Box<str>` that cannot be used in a meaningful way outside of
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
diff --git a/crates/ruma-common/src/lib.rs b/crates/ruma-common/src/lib.rs
index 9438a211..ee6d5feb 100644
--- a/crates/ruma-common/src/lib.rs
+++ b/crates/ruma-common/src/lib.rs
@@ -16,11 +16,19 @@ pub mod thirdparty;
 mod time;
 pub mod to_device;
 
+use std::fmt;
+
 pub use time::{MilliSecondsSinceUnixEpoch, SecondsSinceUnixEpoch};
 
 // Wrapper around `Box<str>` that cannot be used in a meaningful way outside of
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
diff --git a/crates/ruma-events/src/lib.rs b/crates/ruma-events/src/lib.rs
index e52e166a..df563bb9 100644
--- a/crates/ruma-events/src/lib.rs
+++ b/crates/ruma-events/src/lib.rs
@@ -115,7 +115,7 @@
 #![warn(missing_docs)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
-use std::fmt::Debug;
+use std::fmt;
 
 use ruma_identifiers::{EventEncryptionAlgorithm, RoomVersionId};
 use ruma_serde::Raw;
@@ -391,9 +391,15 @@ pub struct UnsignedDeHelper {
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct PrivOwnedStr(Box<str>);
 
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
 /// Helper function for erroring when trying to serialize an event enum _Custom variant that can
 /// only be created by deserializing from an unknown event type.
 #[doc(hidden)]
diff --git a/crates/ruma-federation-api/src/lib.rs b/crates/ruma-federation-api/src/lib.rs
index 9ebb0134..9b182c74 100644
--- a/crates/ruma-federation-api/src/lib.rs
+++ b/crates/ruma-federation-api/src/lib.rs
@@ -8,6 +8,8 @@
 #![warn(missing_docs)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
+use std::fmt;
+
 mod serde;
 
 pub mod authorization;
@@ -28,5 +30,11 @@ pub mod transactions;
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
diff --git a/crates/ruma-identifiers/src/lib.rs b/crates/ruma-identifiers/src/lib.rs
index 1b839a83..08627820 100644
--- a/crates/ruma-identifiers/src/lib.rs
+++ b/crates/ruma-identifiers/src/lib.rs
@@ -18,6 +18,7 @@ extern crate rand_crate as rand;
 
 #[cfg(feature = "serde")]
 use std::convert::TryFrom;
+use std::fmt;
 
 #[cfg(feature = "serde")]
 use serde::de::{self, Deserializer, Unexpected};
@@ -188,5 +189,11 @@ macro_rules! user_id {
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
diff --git a/crates/ruma-identity-service-api/src/lib.rs b/crates/ruma-identity-service-api/src/lib.rs
index 9c725b5d..5c458d96 100644
--- a/crates/ruma-identity-service-api/src/lib.rs
+++ b/crates/ruma-identity-service-api/src/lib.rs
@@ -7,6 +7,8 @@
 
 #![warn(missing_docs)]
 
+use std::fmt;
+
 pub mod association;
 pub mod authentication;
 pub mod invitation;
@@ -19,5 +21,11 @@ pub mod tos;
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
diff --git a/crates/ruma-push-gateway-api/src/lib.rs b/crates/ruma-push-gateway-api/src/lib.rs
index e640b667..dc329f4e 100644
--- a/crates/ruma-push-gateway-api/src/lib.rs
+++ b/crates/ruma-push-gateway-api/src/lib.rs
@@ -7,11 +7,19 @@
 
 #![warn(missing_docs)]
 
+use std::fmt;
+
 pub mod send_event_notification;
 
 // Wrapper around `Box<str>` that cannot be used in a meaningful way outside of
 // this crate. Used for string enums because their `_Custom` variant can't be
 // truly private (only `#[doc(hidden)]`).
 #[doc(hidden)]
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct PrivOwnedStr(Box<str>);
+
+impl fmt::Debug for PrivOwnedStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}