diff --git a/fdbrpc/IAsyncFile.actor.cpp b/fdbrpc/IAsyncFile.actor.cpp
index 64b88bc14c..7a4854e89d 100644
--- a/fdbrpc/IAsyncFile.actor.cpp
+++ b/fdbrpc/IAsyncFile.actor.cpp
@@ -88,7 +88,7 @@ ACTOR static Future<Void> incrementalDeleteHelper( std::string filename, bool mu
 	state bool exists = fileExists(filename);
 
 	if(exists) {
-		Reference<IAsyncFile> f = wait(IAsyncFileSystem::filesystem()->open(filename, IAsyncFile::OPEN_READWRITE | IAsyncFile::OPEN_UNCACHED, 0));
+		Reference<IAsyncFile> f = wait(IAsyncFileSystem::filesystem()->open(filename, IAsyncFile::OPEN_READWRITE | IAsyncFile::OPEN_UNCACHED | IAsyncFile::OPEN_UNBUFFERED, 0));
 		file = f;
 
 		int64_t fileSize = wait(file->size());