diff --git a/src/coins.cpp b/src/coins.cpp
index eac89c030..a3cb5753e 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -561,7 +561,10 @@ unsigned int CCoinsViewCache::GetCacheSize() const {
 const CTxOut &CCoinsViewCache::GetOutputFor(const CTxIn& input) const
 {
     const CCoins* coins = AccessCoins(input.prevout.hash);
+    fprintf(stderr, "GetOutputFor: input=%s", input.ToString().c_str());
+    fprintf(stderr, "GetOutputFor: prevout n=%d,txid=%s\n", input.prevout.n, input.prevout.hash.ToString().c_str());
     assert(coins && coins->IsAvailable(input.prevout.n));
+    fprintf(stderr, "GetOutputFor: IsAvailable\n");
     return coins->vout[input.prevout.n];
 }