diff --git a/src/codegen_backend_arm.h b/src/codegen_backend_arm.h
index cc4a642..bfd5206 100644
--- a/src/codegen_backend_arm.h
+++ b/src/codegen_backend_arm.h
@@ -1,8 +1,8 @@
 #include "codegen_backend_arm_defs.h"
 
-#define BLOCK_SIZE 0x1000
-#define BLOCK_MASK 0x0fff
-#define BLOCK_START 64
+#define BLOCK_SIZE 0x4000
+#define BLOCK_MASK 0x3fff
+#define BLOCK_START 0
 
 #define HASH_SIZE 0x20000
 #define HASH_MASK 0x1ffff
diff --git a/src/codegen_backend_arm64.h b/src/codegen_backend_arm64.h
index cd506e1..1fb0cfb 100644
--- a/src/codegen_backend_arm64.h
+++ b/src/codegen_backend_arm64.h
@@ -1,8 +1,8 @@
 #include "codegen_backend_arm64_defs.h"
 
-#define BLOCK_SIZE 0x1000
-#define BLOCK_MASK 0x0fff
-#define BLOCK_START 64
+#define BLOCK_SIZE 0x4000
+#define BLOCK_MASK 0x3fff
+#define BLOCK_START 0
 
 #define HASH_SIZE 0x20000
 #define HASH_MASK 0x1ffff