diff --git a/src/search/heuristic.cc b/src/search/heuristic.cc
index d13382b339..14e5e0203d 100644
--- a/src/search/heuristic.cc
+++ b/src/search/heuristic.cc
@@ -14,7 +14,7 @@
 
 using namespace std;
 Heuristic::Heuristic(
-    shared_ptr<AbstractTask> transform,
+    const shared_ptr<AbstractTask> &transform,
     bool cache_estimates,
     const string &name,
     utils::Verbosity verbosity)
diff --git a/src/search/heuristic.h b/src/search/heuristic.h
index 95a99c5449..2109b98b18 100644
--- a/src/search/heuristic.h
+++ b/src/search/heuristic.h
@@ -74,7 +74,7 @@ class Heuristic : public Evaluator {
 
 public:
     Heuristic(
-        std::shared_ptr<AbstractTask> transform,
+        const std::shared_ptr<AbstractTask> &transform,
         bool cache_estimates,
         const std::string &name,
         utils::Verbosity verbosity);