diff --git a/documentation/docs/98-reference/.generated/server-errors.md b/documentation/docs/98-reference/.generated/server-errors.md
index 6d852a7524..5bc13b84ac 100644
--- a/documentation/docs/98-reference/.generated/server-errors.md
+++ b/documentation/docs/98-reference/.generated/server-errors.md
@@ -17,7 +17,7 @@ The `html` property of server render results has been deprecated. Use `body` ins
 ### hydratable_clobbering
 
 ```
-Attempted to set hydratable with key `%key%` twice with different values.
+Attempted to set `hydratable` with key `%key%` twice with different values.
 
 First instance occurred at:
 %stack%
@@ -44,7 +44,7 @@ This error occurs when using `hydratable` multiple times with the same key. To a
 ### hydratable_serialization_failed
 
 ```
-Failed to serialize `hydratable` data.
+Failed to serialize `hydratable` data for key `%key%`.
 
 `hydratable` can serialize anything [`uneval` from `devalue`](https://npmjs.com/package/uneval) can, plus Promises. 
 
diff --git a/packages/svelte/messages/server-errors/errors.md b/packages/svelte/messages/server-errors/errors.md
index 30cf4cd2c2..b52176d200 100644
--- a/packages/svelte/messages/server-errors/errors.md
+++ b/packages/svelte/messages/server-errors/errors.md
@@ -10,7 +10,7 @@ You (or the framework you're using) called [`render(...)`](svelte-server#render)
 
 ## hydratable_clobbering
 
-> Attempted to set hydratable with key `%key%` twice with different values.
+> Attempted to set `hydratable` with key `%key%` twice with different values.
 >
 > First instance occurred at:
 > %stack%
@@ -35,7 +35,7 @@ This error occurs when using `hydratable` multiple times with the same key. To a
 
 ## hydratable_serialization_failed
 
-> Failed to serialize `hydratable` data.
+> Failed to serialize `hydratable` data for key `%key%`.
 >
 > `hydratable` can serialize anything [`uneval` from `devalue`](https://npmjs.com/package/uneval) can, plus Promises. 
 >
diff --git a/packages/svelte/src/internal/server/errors.js b/packages/svelte/src/internal/server/errors.js
index aab1659bf1..62e6f22583 100644
--- a/packages/svelte/src/internal/server/errors.js
+++ b/packages/svelte/src/internal/server/errors.js
@@ -27,7 +27,7 @@ export function html_deprecated() {
 }
 
 /**
- * Attempted to set hydratable with key `%key%` twice with different values.
+ * Attempted to set `hydratable` with key `%key%` twice with different values.
  * 
  * First instance occurred at:
  * %stack%
@@ -40,7 +40,7 @@ export function html_deprecated() {
  * @returns {never}
  */
 export function hydratable_clobbering(key, stack, stack2) {
-	const error = new Error(`hydratable_clobbering\nAttempted to set hydratable with key \`${key}\` twice with different values.
+	const error = new Error(`hydratable_clobbering\nAttempted to set \`hydratable\` with key \`${key}\` twice with different values.
 
 First instance occurred at:
 ${stack}
@@ -54,17 +54,18 @@ ${stack2}\nhttps://svelte.dev/e/hydratable_clobbering`);
 }
 
 /**
- * Failed to serialize `hydratable` data.
+ * Failed to serialize `hydratable` data for key `%key%`.
  * 
  * `hydratable` can serialize anything [`uneval` from `devalue`](https://npmjs.com/package/uneval) can, plus Promises. 
  * 
  * Stack:
  * %stack%
+ * @param {string} key
  * @param {string} stack
  * @returns {never}
  */
-export function hydratable_serialization_failed(stack) {
-	const error = new Error(`hydratable_serialization_failed\nFailed to serialize \`hydratable\` data.
+export function hydratable_serialization_failed(key, stack) {
+	const error = new Error(`hydratable_serialization_failed\nFailed to serialize \`hydratable\` data for key \`${key}\`.
 
 \`hydratable\` can serialize anything [\`uneval\` from \`devalue\`](https://npmjs.com/package/uneval) can, plus Promises. 
 
diff --git a/packages/svelte/src/internal/server/hydratable.js b/packages/svelte/src/internal/server/hydratable.js
index 6abc1e2735..b25697cdd6 100644
--- a/packages/svelte/src/internal/server/hydratable.js
+++ b/packages/svelte/src/internal/server/hydratable.js
@@ -69,7 +69,10 @@ function encode(key, value, values, unresolved) {
 			const serialize_promise = value
 				.then(scoped_uneval)
 				.catch((devalue_error) =>
-					e.hydratable_serialization_failed(serialization_stack(entry.stack, devalue_error?.stack))
+					e.hydratable_serialization_failed(
+						key,
+						serialization_stack(entry.stack, devalue_error?.stack)
+					)
 				);
 			serialize_promise.catch(() => {});
 			unresolved?.set(serialize_promise, key);