diff --git a/BasiliskII/src/Unix/vm_alloc.cpp b/BasiliskII/src/Unix/vm_alloc.cpp
index 77365544..587c62c2 100644
--- a/BasiliskII/src/Unix/vm_alloc.cpp
+++ b/BasiliskII/src/Unix/vm_alloc.cpp
@@ -456,10 +456,16 @@ int vm_protect(void * addr, size_t size, int prot)
 
 int vm_get_page_size(void)
 {
-#ifdef _WIN32
-    return 4096;
+#ifdef HAVE_WIN32_VM
+	static unsigned long page_size = 0;
+	if (page_size == 0) {
+		SYSTEM_INFO si;
+		GetSystemInfo(&si);
+		page_size = si.dwAllocationGranularity;
+	}
+	return page_size;
 #else
-    return getpagesize();
+	return getpagesize();
 #endif
 }