diff --git a/src/libfetchers/parser.hh b/src/libfetchers/parser.hh
index e700f8443ec..df5f20b3e5c 100644
--- a/src/libfetchers/parser.hh
+++ b/src/libfetchers/parser.hh
@@ -187,7 +187,7 @@ namespace nix::fetchers {
                     this->parsers
                 );
 
-                schema = std::make_shared<Schema>(Schema{attrSchema});
+                schema = std::make_shared<Schema>(attrSchema);
                 this->attrSchema = std::get_if<Schema::Attrs>(&schema->choice);
                 assert(this->attrSchema);
             }
diff --git a/src/libfetchers/schema.hh b/src/libfetchers/schema.hh
index 014c2d04f61..92238c0f699 100644
--- a/src/libfetchers/schema.hh
+++ b/src/libfetchers/schema.hh
@@ -42,6 +42,9 @@ struct Schema {
 
     std::variant<Primitive, Attrs> choice;
     bool operator==(const Schema & other) const;
+
+    Schema(Primitive && p) : choice(p) {};
+    Schema(Attrs && p) : choice(p) {};
 };
 
 }