diff --git a/streamed_mutation.cc b/streamed_mutation.cc
index 222cfb66c5..3854a1f629 100644
--- a/streamed_mutation.cc
+++ b/streamed_mutation.cc
@@ -37,6 +37,20 @@ operator<<(std::ostream& os, const static_row& row) {
     return os << "{static_row: "<< row._cells << "}";
 }
 
+std::ostream& operator<<(std::ostream& out, position_in_partition_view pos) {
+    out << "{position: " << pos._bound_weight << ":";
+    if (pos._ck) {
+        out << *pos._ck;
+    } else {
+        out << "null";
+    }
+    return out << "}";
+}
+
+std::ostream& operator<<(std::ostream& out, const position_in_partition& pos) {
+    return out << static_cast<position_in_partition_view>(pos);
+}
+
 mutation_fragment::mutation_fragment(static_row&& r)
     : _kind(kind::static_row), _data(std::make_unique<data>())
 {
diff --git a/streamed_mutation.hh b/streamed_mutation.hh
index cbf1f74c5d..7179138422 100644
--- a/streamed_mutation.hh
+++ b/streamed_mutation.hh
@@ -321,6 +321,8 @@ public:
         : _ck(&ck) { }
     position_in_partition_view(range_tag_t, bound_view bv)
         : _bound_weight(weight(bv.kind)), _ck(&bv.prefix) { }
+
+    friend std::ostream& operator<<(std::ostream&, position_in_partition_view);
 };
 
 class position_in_partition {
@@ -438,6 +440,7 @@ public:
             return compare(a, b);
         }
     };
+    friend std::ostream& operator<<(std::ostream&, const position_in_partition&);
 };
 
 inline position_in_partition_view static_row::position() const