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-rw-r--r--src/libexpr/parser.y1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index b7624df7e8aa..7bafd89d8860 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -25,6 +25,7 @@
     
 #include "parser-tab.hh"
 #include "lexer-tab.hh"
+#define YYSTYPE YYSTYPE // workaround a bug in Bison 2.4
 
 #include "nixexpr.hh"
 #include "nixexpr-ast.hh"