diff --git a/src/libexpr/include/nix/expr/nixexpr.hh b/src/libexpr/include/nix/expr/nixexpr.hh
index 392545069..5121b9d98 100644
--- a/src/libexpr/include/nix/expr/nixexpr.hh
+++ b/src/libexpr/include/nix/expr/nixexpr.hh
@@ -592,11 +592,11 @@ public:
 struct ExprCall : Expr
 {
     Expr * fun;
-    std::vector<Expr *> args;
+    std::pmr::vector<Expr *> args;
     PosIdx pos;
     std::optional<PosIdx> cursedOrEndPos; // used during parsing to warn about https://github.com/NixOS/nix/issues/11118
 
-    ExprCall(const PosIdx & pos, Expr * fun, std::vector<Expr *> && args)
+    ExprCall(const PosIdx & pos, Expr * fun, std::pmr::vector<Expr *> && args)
         : fun(fun)
         , args(args)
         , pos(pos)
@@ -604,7 +604,7 @@ struct ExprCall : Expr
     {
     }
 
-    ExprCall(const PosIdx & pos, Expr * fun, std::vector<Expr *> && args, PosIdx && cursedOrEndPos)
+    ExprCall(const PosIdx & pos, Expr * fun, std::pmr::vector<Expr *> && args, PosIdx && cursedOrEndPos)
         : fun(fun)
         , args(args)
         , pos(pos)
@@ -836,7 +836,7 @@ public:
     // we define some calls to add explicitly so that the argument can be passed in as initializer lists
     template<class C>
     [[gnu::always_inline]]
-    C * add(const PosIdx & pos, Expr * fun, std::vector<Expr *> && args)
+    C * add(const PosIdx & pos, Expr * fun, std::pmr::vector<Expr *> && args)
         requires(std::same_as<C, ExprCall>)
     {
         return alloc.new_object<C>(pos, fun, std::move(args));
@@ -844,7 +844,7 @@ public:
 
     template<class C>
     [[gnu::always_inline]]
-    C * add(const PosIdx & pos, Expr * fun, std::vector<Expr *> && args, PosIdx && cursedOrEndPos)
+    C * add(const PosIdx & pos, Expr * fun, std::pmr::vector<Expr *> && args, PosIdx && cursedOrEndPos)
         requires(std::same_as<C, ExprCall>)
     {
         return alloc.new_object<C>(pos, fun, std::move(args), std::move(cursedOrEndPos));
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 3cfc6f936..c4333eced 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -129,7 +129,7 @@ static Expr * makeCall(Exprs & exprs, PosIdx pos, Expr * fn, Expr * arg) {
 %type <Expr *> start expr expr_function expr_if expr_op
 %type <Expr *> expr_select expr_simple expr_app
 %type <Expr *> expr_pipe_from expr_pipe_into
-%type <std::vector<Expr *>> list
+%type <std::pmr::vector<Expr *>> list
 %type <ExprAttrs *> binds binds1
 %type <FormalsBuilder> formals formal_set
 %type <Formal> formal