diff --git a/.changeset/three-elephants-breathe.md b/.changeset/three-elephants-breathe.md
new file mode 100644
index 000000000000..4da4430afc1f
--- /dev/null
+++ b/.changeset/three-elephants-breathe.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': patch
+---
+
+Fix incorrect set-cookie header handling on adapter-netlify
diff --git a/packages/adapter-netlify/src/handler.js b/packages/adapter-netlify/src/handler.js
index fcf928145ccf..a81c53978d54 100644
--- a/packages/adapter-netlify/src/handler.js
+++ b/packages/adapter-netlify/src/handler.js
@@ -73,7 +73,8 @@ function split_headers(headers) {
 
 	headers.forEach((value, key) => {
 		if (key === 'set-cookie') {
-			m[key] = value.split(', ');
+			// @ts-expect-error (headers.raw() is non-standard)
+			m[key] = headers.raw()[key];
 		} else {
 			h[key] = value;
 		}