diff --git a/amount.cc b/amount.cc
index 4662dbad..d1668e56 100644
--- a/amount.cc
+++ b/amount.cc
@@ -478,7 +478,7 @@ int amount_t::sign() const
 bool amount_t::operator OP(const amount_t& amt) const		\
 {								\
   if (! quantity)						\
-    return amt OP 0;						\
+    return 0 OP amt;						\
   if (! amt.quantity)						\
     return *this OP 0;						\
 								\