diff --git a/include/xo/reader2/SchematikaReader.hpp b/include/xo/reader2/SchematikaReader.hpp
index 73b8166b..5a4243a1 100644
--- a/include/xo/reader2/SchematikaReader.hpp
+++ b/include/xo/reader2/SchematikaReader.hpp
@@ -49,7 +49,7 @@ namespace xo {
              **/
             SchematikaReader(const ReaderConfig & config,
                              obj<AAllocator> expr_alloc,
-                             obj<AAllocator> fixed_alloc);
+                             obj<AAllocator> aux_alloc);
 
             /** non-trivial dtor because of @p parser **/
             ~SchematikaReader() = default;
diff --git a/src/reader2/SchematikaParser.cpp b/src/reader2/SchematikaParser.cpp
index 48e109da..37ebdd05 100644
--- a/src/reader2/SchematikaParser.cpp
+++ b/src/reader2/SchematikaParser.cpp
@@ -22,12 +22,12 @@ namespace xo {
 
         SchematikaParser::SchematikaParser(const ParserConfig & cfg,
                                            obj<AAllocator> expr_alloc,
-                                           obj<AAllocator> fixed_alloc)
+                                           obj<AAllocator> aux_alloc)
         : psm_{cfg.parser_arena_config_,
                cfg.symtab_config_,
                cfg.max_stringtable_capacity_,
                expr_alloc,
-               fixed_alloc},
+               aux_alloc},
           debug_flag_{cfg.debug_flag_}
         {
         }
diff --git a/src/reader2/SchematikaReader.cpp b/src/reader2/SchematikaReader.cpp
index e02eefa2..98d44112 100644
--- a/src/reader2/SchematikaReader.cpp
+++ b/src/reader2/SchematikaReader.cpp
@@ -11,7 +11,7 @@ namespace xo {
     namespace scm {
         SchematikaReader::SchematikaReader(const ReaderConfig & config,
                                            obj<AAllocator> expr_alloc,
-                                           obj<AAllocator> fixed_alloc)
+                                           obj<AAllocator> aux_alloc)
                 : tokenizer_{config.tk_buffer_config_,
                              config.tk_debug_flag_},
                   parser_{ParserConfig(config.parser_arena_config_,
@@ -19,7 +19,7 @@ namespace xo {
                                        config.max_stringtable_cap_,
                                        config.parser_debug_flag_),
                           expr_alloc,
-                          fixed_alloc},
+                          aux_alloc},
                   debug_flag_{config.reader_debug_flag_}
         {
         }