diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index e4b7ff7dbdf..25bcc653d3c 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -41,6 +41,8 @@ static void yyerror(YYLTYPE *loc, _mesa_glsl_parse_state *st, const char *msg)
 }
 %}
 
+%expect 0
+
 %pure-parser
 %error-verbose