diff --git a/src/codegen/codegen_x86-64.c b/src/codegen/codegen_x86-64.c
index 289411b37..ff1e1c682 100644
--- a/src/codegen/codegen_x86-64.c
+++ b/src/codegen/codegen_x86-64.c
@@ -67,7 +67,7 @@ void codegen_init()
 #if _WIN64
         codeblock = VirtualAlloc(NULL, BLOCK_SIZE * sizeof(codeblock_t), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
 #elif defined(__unix__) || defined(__APPLE__)
-        codeblock = mmap(NULL, BLOCK_SIZE * sizeof(codeblock_t), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, 0, 0);
+        codeblock = mmap(NULL, BLOCK_SIZE * sizeof(codeblock_t), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
 #else
         codeblock = malloc(BLOCK_SIZE * sizeof(codeblock_t));
 #endif