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-rw-r--r--src/libexpr/parser.y2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index d89d92c7a2ad..8a084fea0697 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -252,7 +252,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
   nix::Formals * formals;
   nix::Formal * formal;
   nix::NixInt n;
-  char * id; // !!! -> Symbol
+  const char * id; // !!! -> Symbol
   char * path;
   char * uri;
   std::vector<nix::AttrName> * attrNames;