diff --git a/src/codegen_new/codegen_allocator.c b/src/codegen_new/codegen_allocator.c
index ad07afd73..7b8b04323 100644
--- a/src/codegen_new/codegen_allocator.c
+++ b/src/codegen_new/codegen_allocator.c
@@ -39,9 +39,9 @@ void codegen_allocator_init()
         /* TODO: check deployment target: older Intel-based versions of macOS don't play
            nice with MAP_JIT. */
 #elif defined(__APPLE__) && defined(MAP_JIT)
-        mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE|MAP_JIT, 0, 0);
+        mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE|MAP_JIT, -1, 0);
 #else
-        mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, 0, 0);
+        mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
 #endif
 
         for (c = 0; c < MEM_BLOCK_NR; c++)