diff --git a/src/llama.cpp b/src/llama.cpp
index bc88c8487..6caf74e51 100644
--- a/src/llama.cpp
+++ b/src/llama.cpp
@@ -1802,6 +1802,13 @@ struct llama_mmap {
 
         if (prefetch > 0) {
             // PrefetchVirtualMemory is only present on Windows 8 and above, so we dynamically load it
+#if (_WIN32_WINNT < _WIN32_WINNT_WIN8)
+            typedef struct _WIN32_MEMORY_RANGE_ENTRY {
+                PVOID VirtualAddress;
+                SIZE_T NumberOfBytes;
+            } WIN32_MEMORY_RANGE_ENTRY, *PWIN32_MEMORY_RANGE_ENTRY;
+#endif // (_WIN32_WINNT >= _WIN32_WINNT_WIN8)
+
             BOOL (WINAPI *pPrefetchVirtualMemory) (HANDLE, ULONG_PTR, PWIN32_MEMORY_RANGE_ENTRY, ULONG);
             HMODULE hKernel32 = GetModuleHandleW(L"kernel32.dll");