diff --git a/src/codegen/codegen_x86-64.c b/src/codegen/codegen_x86-64.c
index 4289235fe..4ba66d76b 100644
--- a/src/codegen/codegen_x86-64.c
+++ b/src/codegen/codegen_x86-64.c
@@ -281,7 +281,7 @@ void codegen_block_start_recompile(codeblock_t *block)
         block->status = cpu_cur_status;
 
         block_pos = BLOCK_GPF_OFFSET;
-#ifdef OLD_GPF
+#ifndef NEW_GPF
 #if _WIN64
         addbyte(0x48); /*XOR RCX, RCX*/
         addbyte(0x31);
diff --git a/src/codegen/codegen_x86-64.h b/src/codegen/codegen_x86-64.h
index 1ef81ff89..034b17355 100644
--- a/src/codegen/codegen_x86-64.h
+++ b/src/codegen/codegen_x86-64.h
@@ -8,7 +8,7 @@
 #define HASH(l) ((l) & 0x1ffff)
 
 #define BLOCK_EXIT_OFFSET 0x7e0
-#ifdef OLD_GPF
+#ifndef NEW_GPF
 #define BLOCK_GPF_OFFSET (BLOCK_EXIT_OFFSET - 20)
 #else
 #define BLOCK_GPF_OFFSET (BLOCK_EXIT_OFFSET - 12)