diff --git a/src/net/bdew/lib/recipes/gencfg/GenericConfigParser.scala b/src/net/bdew/lib/recipes/gencfg/GenericConfigParser.scala
index 38bf4fe..da13b42 100644
--- a/src/net/bdew/lib/recipes/gencfg/GenericConfigParser.scala
+++ b/src/net/bdew/lib/recipes/gencfg/GenericConfigParser.scala
@@ -13,7 +13,9 @@ import net.bdew.lib.recipes.RecipeParser
 
 trait GenericConfigParser extends RecipeParser {
   override def statement = statementCfg | super.statement
-  def cfgStatementNum = ident ~ "=" ~ decimalNumber ^^ { case id ~ eq ~ n => CfgVal(id, EntryDouble(n.toDouble)) }
+  def negativeNumber = "-" ~> decimalNumber ^^ { case x => "-" + x }
+  def signedNumber = decimalNumber | negativeNumber
+  def cfgStatementNum = ident ~ "=" ~ signedNumber ^^ { case id ~ eq ~ n => CfgVal(id, EntryDouble(n.toDouble)) }
   def cfgStatementStr = ident ~ "=" ~ str ^^ { case id ~ eq ~ s => CfgVal(id, EntryStr(s)) }
   def cfgStatementSub = cfgBlock ^^ { case (id, st) => CfgSub(id, st) }