diff --git a/src/changelog/unreleased.md b/src/changelog/unreleased.md
index f3a0f6d2c3..3ed337ce42 100644
--- a/src/changelog/unreleased.md
+++ b/src/changelog/unreleased.md
@@ -39,3 +39,7 @@ The migration guide could reference other migration examples in the current
 changelog entry.
 
 ## Unreleased
+
+### Added
+
+- On Web, implement `Error` for `platform::web::CustomCursorError`.
diff --git a/src/platform/web.rs b/src/platform/web.rs
index 23831ceaa3..a48c6b09b4 100644
--- a/src/platform/web.rs
+++ b/src/platform/web.rs
@@ -461,3 +461,5 @@ impl Display for CustomCursorError {
         }
     }
 }
+
+impl Error for CustomCursorError {}