diff --git a/tools/compare.cpp b/tools/compare.cpp
index a9ab558..ca501b6 100644
--- a/tools/compare.cpp
+++ b/tools/compare.cpp
@@ -53,7 +53,9 @@ namespace emory {
         struct side {
             IdT id;
             chunk data;
-        } src, dst;
+        };
+
+        side src, dst;
 
 
         struct src_equality {
@@ -98,6 +100,16 @@ namespace emory {
     };
 
 
+    template <typename IdT>
+    std::ostream&
+    operator<< (std::ostream &os, match<IdT> const &val)
+    {
+        return os << "{ src: { id: " << val.src.id << ", data: " << val.src.data << " }"
+                  << ", dst: { id: " << val.dst.id << ", data: " << val.dst.data << " }"
+                  << " }";
+    }
+
+
     std::vector<match<map const*>> common (map const &a, map const &b);
 }
 
@@ -246,7 +258,7 @@ int main (int argc, char const **argv)
     std::size_t matching = 0;
     std::vector<std::size_t> source_bytes (argc - ARGS_SOURCE, 0);
     for (auto const &i: found) {
-        std::cout << i.dst.data << '\n';
+        std::cout << i << '\n';
         auto const size = i.dst.data.offset.second - i.dst.data.offset.first;
         matching += size;
         source_bytes[i.src.id - ARGS_SOURCE] += size;