diff --git a/server/modules/filter/dbfwfilter/ruleparser.y b/server/modules/filter/dbfwfilter/ruleparser.y
index 33ad53cfe..ba65ed381 100644
--- a/server/modules/filter/dbfwfilter/ruleparser.y
+++ b/server/modules/filter/dbfwfilter/ruleparser.y
@@ -27,7 +27,7 @@
 %pure-parser
 
 /** Prefix all functions */
-%name-prefix="dbfw_yy"
+%name-prefix "dbfw_yy"
 
 /** The pure parser requires one extra parameter */
 %parse-param {void* scanner}