diff --git a/CMakeLists.txt b/CMakeLists.txt
index ed94cb2..6c89538 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 find_package(Filesystem REQUIRED)
 
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -Wall -fno-pie -no-pie")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -Wall -fno-pie -no-pie -D_LARGEFILE64_SOURCE")
 
 include_directories(.)
 add_executable(wibo
diff --git a/main.cpp b/main.cpp
index 31f2287..9955493 100644
--- a/main.cpp
+++ b/main.cpp
@@ -310,7 +310,7 @@ static void blockUpper2GB() {
 			holdingMapStart = std::max(holdingMapStart, FILL_MEMORY_ABOVE);
 
 			// DEBUG_LOG("Mapping %08x-%08x\n", holdingMapStart, holdingMapEnd);
-			void* holdingMap = mmap((void*) holdingMapStart, holdingMapEnd - holdingMapStart, PROT_READ, MAP_ANONYMOUS|MAP_FIXED|MAP_PRIVATE, -1, 0);
+			void* holdingMap = mmap((void*) holdingMapStart, holdingMapEnd - holdingMapStart, PROT_READ | PROT_WRITE, MAP_ANONYMOUS|MAP_FIXED|MAP_PRIVATE, -1, 0);
 
 			if (holdingMap == MAP_FAILED) {
 				perror("Failed to create holding map");