diff --git a/vm/pc/dump.c b/vm/pc/dump.c
index 8532041..334274b 100644
--- a/vm/pc/dump.c
+++ b/vm/pc/dump.c
@@ -13,7 +13,9 @@ char *cond_suffixes[] =
     "?"
 };
 
-#define _ATT_STYLE 0
+#ifndef _ATT_STYLE
+#define _ATT_STYLE 1
+#endif
 
 static void dump_acc(ctx_t *ctx, acc_t *p);
 
@@ -31,7 +33,7 @@ void dump_instr(ctx_t *ctx,
     if (lock)
         log("lock");
 
-#if !_ATT_STYLE
+#if _ATT_STYLE == 0
     log("%s", in->name);
 #else
     char s1[2] = {0, 0}, s2[2] = {0, 0};
@@ -69,14 +71,14 @@ void dump_instr(ctx_t *ctx,
     else
         log("\t");
 
-    if (p1) {
-#if !_ATT_STYLE
+    if (p1)
+    {
+#if _ATT_STYLE == 0
         dump_acc(ctx, p1);
         if (p2) {
             log(", ");
             dump_acc(ctx, p2);
         }
-    }
 #else
         if (p2) {
             dump_acc(ctx, p2);
@@ -89,7 +91,7 @@ void dump_instr(ctx_t *ctx,
     log("\n");
 }
 
-#if !_ATT_STYLE
+#if _ATT_STYLE == 0
 
 void dump_acc(ctx_t *ctx, acc_t *p)
 {