diff --git a/test/unittest/documenttest.cpp b/test/unittest/documenttest.cpp
index 940b295..a6cf8d9 100644
--- a/test/unittest/documenttest.cpp
+++ b/test/unittest/documenttest.cpp
@@ -238,7 +238,7 @@ TEST(Document, AcceptWriter) {
 TEST(Document, UserBuffer) {
     typedef GenericDocument<UTF8<>, MemoryPoolAllocator<>, MemoryPoolAllocator<> > DocumentType;
     char valueBuffer[4096];
-    char parseBuffer[1024];
+    char parseBuffer[2048];
     MemoryPoolAllocator<> valueAllocator(valueBuffer, sizeof(valueBuffer));
     MemoryPoolAllocator<> parseAllocator(parseBuffer, sizeof(parseBuffer));
     DocumentType doc(&valueAllocator, sizeof(parseBuffer), &parseAllocator);