diff --git a/malloc/malloc.c b/malloc/malloc.c
index ecdb2a0f36..9ce0941b9a 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1635,7 +1635,7 @@ static INTERNAL_SIZE_T global_max_fast;
 
 #define set_max_fast(s) \
   global_max_fast = (((s) == 0)						      \
-                     ? SMALLBIN_WIDTH : ((s + SIZE_SZ) & ~MALLOC_ALIGN_MASK))
+                     ? MIN_CHUNK_SIZE / 2 : ((s + SIZE_SZ) & ~MALLOC_ALIGN_MASK))
 
 static inline INTERNAL_SIZE_T
 get_max_fast (void)