diff --git a/src/libexpr/include/nix/expr/nixexpr.hh b/src/libexpr/include/nix/expr/nixexpr.hh
index 673c14cb3..8a6b02cc7 100644
--- a/src/libexpr/include/nix/expr/nixexpr.hh
+++ b/src/libexpr/include/nix/expr/nixexpr.hh
@@ -395,9 +395,9 @@ struct ExprAttrs : Expr
         }
     };
 
-    typedef std::map<Symbol, AttrDef> AttrDefs;
+    typedef std::pmr::map<Symbol, AttrDef> AttrDefs;
     AttrDefs attrs;
-    std::unique_ptr<std::vector<Expr *>> inheritFromExprs;
+    std::unique_ptr<std::pmr::vector<Expr *>> inheritFromExprs;
 
     struct DynamicAttrDef
     {
@@ -409,7 +409,7 @@ struct ExprAttrs : Expr
             , pos(pos) {};
     };
 
-    typedef std::vector<DynamicAttrDef> DynamicAttrDefs;
+    typedef std::pmr::vector<DynamicAttrDef> DynamicAttrDefs;
     DynamicAttrDefs dynamicAttrs;
     ExprAttrs(const PosIdx & pos)
         : recursive(false)
diff --git a/src/libexpr/include/nix/expr/parser-state.hh b/src/libexpr/include/nix/expr/parser-state.hh
index 9e1d17b53..e31635b57 100644
--- a/src/libexpr/include/nix/expr/parser-state.hh
+++ b/src/libexpr/include/nix/expr/parser-state.hh
@@ -181,7 +181,7 @@ ParserState::addAttr(ExprAttrs * attrs, AttrPath & attrPath, const Symbol & symb
         // See https://github.com/NixOS/nix/issues/9020.
         if (jAttrs && ae) {
             if (ae->inheritFromExprs && !jAttrs->inheritFromExprs)
-                jAttrs->inheritFromExprs = std::make_unique<std::vector<Expr *>>();
+                jAttrs->inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>();
             for (auto & ad : ae->attrs) {
                 if (ad.second.kind == ExprAttrs::AttrDef::Kind::InheritedFrom) {
                     auto & sel = dynamic_cast<ExprSelect &>(*ad.second.e);
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index df700cab2..f56a695ec 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -423,7 +423,7 @@ binds1
   | binds[accum] INHERIT '(' expr ')' attrs ';'
     { $$ = $accum;
       if (!$accum->inheritFromExprs)
-          $accum->inheritFromExprs = std::make_unique<std::vector<Expr *>>();
+          $accum->inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>();
       $accum->inheritFromExprs->push_back($expr);
       auto from = state->exprs.add<ExprInheritFrom>(state->at(@expr), $accum->inheritFromExprs->size() - 1);
       for (auto & [i, iPos] : $attrs) {