diff --git a/BeefySysLib/platform/wasm/WasmCommon.cpp b/BeefySysLib/platform/wasm/WasmCommon.cpp
index d901a121..c6bf2d36 100644
--- a/BeefySysLib/platform/wasm/WasmCommon.cpp
+++ b/BeefySysLib/platform/wasm/WasmCommon.cpp
@@ -1,3 +1,6 @@
+#define lseek64 lseek
+#define ftruncate64 ftruncate
+
 #include "../posix/PosixCommon.cpp"
 
 extern "C" uintptr_t _Unwind_GetIP(struct _Unwind_Context *context)