diff --git a/src/zmalloc.cpp b/src/zmalloc.cpp
index e3d364a97..f88fee638 100644
--- a/src/zmalloc.cpp
+++ b/src/zmalloc.cpp
@@ -83,17 +83,8 @@ static_assert((PREFIX_SIZE % 16) == 0, "Our prefix must be modulo 16-bytes or ou
 #define realloc(ptr,size,type) realloc(ptr,size)
 #endif
 
-#define update_zmalloc_stat_alloc(__n) do { \
-    size_t _n = (__n); \
-    if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
-    atomicIncr(used_memory,__n); \
-} while(0)
-
-#define update_zmalloc_stat_free(__n) do { \
-    size_t _n = (__n); \
-    if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
-    atomicDecr(used_memory,__n); \
-} while(0)
+#define update_zmalloc_stat_alloc(__n) atomicIncr(used_memory,(__n))
+#define update_zmalloc_stat_free(__n) atomicDecr(used_memory,(__n))
 
 static size_t used_memory = 0;
 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;