diff --git a/src/libexpr/eval-settings.cc b/src/libexpr/eval-settings.cc
index ebb9e5bbd..b54afdce1 100644
--- a/src/libexpr/eval-settings.cc
+++ b/src/libexpr/eval-settings.cc
@@ -103,13 +103,4 @@ Path getNixDefExpr()
         : getHome() + "/.nix-defexpr";
 }
 
-void EvalSettings::addPrimOp(PrimOp && primOp)
-{
-    extraPrimOps.emplace_back(std::move(primOp));
-}
-void EvalSettings::addPrimOp(const PrimOp & primOp)
-{
-    extraPrimOps.emplace_back(PrimOp(primOp));
-}
-
 } // namespace nix
\ No newline at end of file
diff --git a/src/libexpr/eval-settings.hh b/src/libexpr/eval-settings.hh
index 368173b01..d16fd4035 100644
--- a/src/libexpr/eval-settings.hh
+++ b/src/libexpr/eval-settings.hh
@@ -53,15 +53,6 @@ struct EvalSettings : Config
 
     std::vector<PrimOp> extraPrimOps;
 
-    /**
-     * Register a primop to be added when an EvalState is created from these settings.
-     */
-    void addPrimOp(PrimOp && primOp);
-    /**
-     * Register a primop to be added when an EvalState is created from these settings.
-     */
-    void addPrimOp(const PrimOp & primOp);
-
     Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation", R"(
         Enable built-in functions that allow executing native code.
 
diff --git a/src/libflake/flake/settings.cc b/src/libflake/flake/settings.cc
index 4ceca38ec..cac7c4384 100644
--- a/src/libflake/flake/settings.cc
+++ b/src/libflake/flake/settings.cc
@@ -5,11 +5,11 @@ namespace nix::flake {
 
 Settings::Settings() {}
 
-void Settings::configureEvalSettings(nix::EvalSettings & evalSettings)
+void Settings::configureEvalSettings(nix::EvalSettings & evalSettings) const
 {
-    evalSettings.addPrimOp(primops::getFlake(*this));
-    evalSettings.addPrimOp(primops::parseFlakeRef);
-    evalSettings.addPrimOp(primops::flakeRefToString);
+    evalSettings.extraPrimOps.emplace_back(primops::getFlake(*this));
+    evalSettings.extraPrimOps.emplace_back(primops::parseFlakeRef);
+    evalSettings.extraPrimOps.emplace_back(primops::flakeRefToString);
 }
 
 } // namespace nix
diff --git a/src/libflake/flake/settings.hh b/src/libflake/flake/settings.hh
index f629f3e74..5f0d9fb21 100644
--- a/src/libflake/flake/settings.hh
+++ b/src/libflake/flake/settings.hh
@@ -17,7 +17,7 @@ struct Settings : public Config
 {
     Settings();
 
-    void configureEvalSettings(nix::EvalSettings & evalSettings);
+    void configureEvalSettings(nix::EvalSettings & evalSettings) const;
 
     Setting<bool> useRegistries{
         this,