diff --git a/src/Func.h b/src/Func.h
index f6808484d5..d22a8cc716 100644
--- a/src/Func.h
+++ b/src/Func.h
@@ -211,6 +211,15 @@ public:
         return *captures_vec;
     }
 
+    /**
+     * Set the set of ZVal's used for captures.
+     *
+     * Used for script optimization purposes.
+     *
+     * @param cv The value used for captures_vec.
+     */
+    void SetCapturesVec(std::unique_ptr<std::vector<ZVal>> cv) { captures_vec = std::move(cv); }
+
     // Same definition as in Frame.h.
     using OffsetMap = std::unordered_map<std::string, int>;
 
@@ -291,9 +300,6 @@ protected:
      */
     virtual void SetCaptures(Frame* f);
 
-    // Captures when using ZVal block instead of a Frame.
-    std::unique_ptr<std::vector<ZVal>> captures_vec;
-
 private:
     size_t frame_size = 0;
 
@@ -307,6 +313,9 @@ private:
 
     OffsetMap* captures_offset_mapping = nullptr;
 
+    // Captures when using ZVal block instead of a Frame.
+    std::unique_ptr<std::vector<ZVal>> captures_vec;
+
     // The most recently added/updated body ...
     StmtPtr current_body;
 
diff --git a/src/script_opt/CPP/Func.h b/src/script_opt/CPP/Func.h
index 9a12cb2921..4642c2fdaa 100644
--- a/src/script_opt/CPP/Func.h
+++ b/src/script_opt/CPP/Func.h
@@ -77,7 +77,6 @@ protected:
     // Methods related to sending lambdas via Broker.
     std::optional<BrokerData> SerializeCaptures() const override;
     void SetCaptures(Frame* f) override;
-    void SetCapturesVec(std::unique_ptr<std::vector<ZVal>> _captures_vec) { captures_vec = std::move(_captures_vec); }
 
     FuncPtr DoClone() override;