diff --git a/grammar.ebnf b/grammar.ebnf
index dcb5f8e6644aa3119f61daf5ca315cf8c175889a..96e749067a5b668b3bd473de61925c4e2663738f 100644
--- a/grammar.ebnf
+++ b/grammar.ebnf
@@ -2,7 +2,7 @@ Ambiguator ::= ("<" | ">" | "less than" | "more than")
 
 /* Amount: quantity of an ingredient */
 /* Eg: 10 - 20 g of pasta */
-Amount ::= Ambiguator* Digit+ ("-" | "/" | "to")? Digit*
+Amount ::= Ambiguator* Number+ ("-" | "/" | "to")? Number*
 
 /* Number: */
 Number ::= ("0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9")+