diff --git a/.changeset/add-instant-scroll-behavior.md b/.changeset/add-instant-scroll-behavior.md
new file mode 100644
index 00000000..9af3a35a
--- /dev/null
+++ b/.changeset/add-instant-scroll-behavior.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/virtual-core': patch
+---
+
+Add 'instant' to ScrollBehavior type to match the W3C spec
diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 6c1cafa4..f84d44e8 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -8,7 +8,7 @@ type ScrollDirection = 'forward' | 'backward'
 
 type ScrollAlignment = 'start' | 'center' | 'end' | 'auto'
 
-type ScrollBehavior = 'auto' | 'smooth'
+type ScrollBehavior = 'auto' | 'smooth' | 'instant'
 
 export interface ScrollToOptions {
   align?: ScrollAlignment