1 files changed, 2 insertions, 1 deletions
diff --git a/src/mem.c b/src/mem.c
index 79affcaa9b..6beede9f6e 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -91,7 +91,8 @@ struct rt_small_mem
 #define MIN_SIZE 12
 #endif /* ARCH_CPU_64BIT */
 
-#define MEM_MASK             0xfffffffe
+#define MEM_MASK ((~(rt_size_t)0) - 1)
+
 #define MEM_USED()         ((((rt_base_t)(small_mem)) & MEM_MASK) | 0x1)
 #define MEM_FREED()        ((((rt_base_t)(small_mem)) & MEM_MASK) | 0x0)
 #define MEM_ISUSED(_mem)   \