diff --git a/lang/lex.c b/lang/lex.c
index 697b455..f7ae876 100644
--- a/lang/lex.c
+++ b/lang/lex.c
@@ -1022,7 +1022,7 @@ static enum ivy_status pump_tokens(struct ivy_lexer *lex)
 		return read_ident(lex);
 	}
 
-	if (isnumber(c)) {
+	if (isdigit(c)) {
 		return read_number(lex);
 	}