diff --git a/src/bun.js/bindings/JSBuffer.cpp b/src/bun.js/bindings/JSBuffer.cpp
index 19d0f7b923..aec9e82b19 100644
--- a/src/bun.js/bindings/JSBuffer.cpp
+++ b/src/bun.js/bindings/JSBuffer.cpp
@@ -153,7 +153,7 @@ public:
             return JSC::JSValue::encode(JSC::jsUndefined());
         }
 
-        auto thisObject = JSC::jsCast<JSC::JSUint8Array*>(thisValue);
+        auto thisObject = JSC::jsDynamicCast<JSC::JSUint8Array*>(thisValue);
         if (UNLIKELY(!thisObject))
             return throwThisTypeError(lexicalGlobalObject, throwScope, "Buffer", operationName);