diff --git a/x86_64-gen.c b/x86_64-gen.c
index d837a1d..90c8247 100644
--- a/x86_64-gen.c
+++ b/x86_64-gen.c
@@ -1066,12 +1066,8 @@ static X86_64_Mode classify_x86_64_inner(CType *ty)
     case VT_STRUCT:
         f = ty->ref;
 
-        // Detect union
-        if (f->next && (f->c == f->next->c))
-          return x86_64_mode_memory;
-        
         mode = x86_64_mode_none;
-        for (; f; f = f->next)
+        for (f = f->next; f; f = f->next)
             mode = classify_x86_64_merge(mode, classify_x86_64_inner(&f->type));
         
         return mode;