diff --git a/projects/packages/forms/changelog/fix-form-validation-with-js-disabled b/projects/packages/forms/changelog/fix-form-validation-with-js-disabled
new file mode 100644
index 0000000000000..c62b7f9952d1a
--- /dev/null
+++ b/projects/packages/forms/changelog/fix-form-validation-with-js-disabled
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Forms: Fix 404 error when a user submits an invalid form with JavaScript disabled.
diff --git a/projects/packages/forms/src/contact-form/class-contact-form.php b/projects/packages/forms/src/contact-form/class-contact-form.php
index 5f51e6747390a..f649ea9c3e7b1 100644
--- a/projects/packages/forms/src/contact-form/class-contact-form.php
+++ b/projects/packages/forms/src/contact-form/class-contact-form.php
@@ -249,7 +249,7 @@ public static function style_on() {
 	 * @return string HTML for the concat form.
 	 */
 	public static function parse( $attributes, $content ) {
-		global $post, $page; // $page is used in the contact-form submission redirect
+		global $post, $page, $multipage; // $page is used in the contact-form submission redirect
 		if ( Settings::is_syncing() ) {
 			return '';
 		}
@@ -346,7 +346,7 @@ public static function parse( $attributes, $content ) {
 			} else {
 				// Submit form to the post permalink
 				$url = get_permalink();
-				if ( $page ) {
+				if ( $multipage && $page ) {
 					$url = add_query_arg( 'page', $page, $url );
 				}
 			}
diff --git a/projects/plugins/jetpack/changelog/fix-form-validation-with-js-disabled b/projects/plugins/jetpack/changelog/fix-form-validation-with-js-disabled
new file mode 100644
index 0000000000000..7830d76e77574
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/fix-form-validation-with-js-disabled
@@ -0,0 +1,4 @@
+Significance: patch
+Type: bugfix
+
+Forms: Fix 404 error when a user submits an invalid form with JavaScript disabled.