diff --git a/crates/ruma-identifiers/src/macros.rs b/crates/ruma-identifiers/src/macros.rs
index ec121f4a..4e8dc5e7 100644
--- a/crates/ruma-identifiers/src/macros.rs
+++ b/crates/ruma-identifiers/src/macros.rs
@@ -205,7 +205,7 @@ macro_rules! opaque_identifier {
 
         impl std::fmt::Debug for $id {
             fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-                f.write_str(self.as_ref())
+                <str as std::fmt::Debug>::fmt(self.as_str(), f)
             }
         }
 
@@ -338,7 +338,7 @@ macro_rules! opaque_identifier_validated {
 
         impl std::fmt::Debug for $id {
             fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-                f.write_str(self.as_ref())
+                <str as std::fmt::Debug>::fmt(self.as_str(), f)
             }
         }