diff --git a/src/kernel/include/memory.h b/src/kernel/include/memory.h
index c66d3ae..8af8e45 100644
--- a/src/kernel/include/memory.h
+++ b/src/kernel/include/memory.h
@@ -6,8 +6,8 @@
 #define P2V(a) ((a) + KERNEL_OFFSET)
 #else
 #include <stdint.h>
-#define V2P(a) ((uintptr_t)(a) - KERNEL_OFFSET)
-#define P2V(a) ((void *)((uintptr_t)(a) + KERNEL_OFFSET))
+#define V2P(a) ((uintptr_t)(a) & ~KERNEL_OFFSET)
+#define P2V(a) ((void *)((uintptr_t)(a) | KERNEL_OFFSET))
 #endif
 
 #define P1_OFFSET(a) (((a)>>12) & 0x1FF)