diff --git a/flow/debug_print.cc b/flow/debug_print.cc
index 6326153aaa7..e2d7fc3f4c8 100644
--- a/flow/debug_print.cc
+++ b/flow/debug_print.cc
@@ -73,9 +73,7 @@ std::ostream& operator<<(std::ostream& os, const SkPoint& r) {
 }
 
 std::ostream& operator<<(std::ostream& os, const flow::RasterCacheKey& k) {
-  SkString matrix_string;
-  k.matrix().toString(&matrix_string);
-  os << "Picture: " << k.picture_id() << " matrix: " << matrix_string.c_str();
+  os << "Picture: " << k.picture_id() << " matrix: " << k.matrix();
   return os;
 }