diff --git a/parse.y b/parse.y
index c10dfe6..1c58e13 100644
--- a/parse.y
+++ b/parse.y
@@ -6923,6 +6923,7 @@ parser_yylex(struct parser_params *parser)
 		    tokfix();
 		    if (toklen() == start) {
 			yyerror("numeric literal without digits");
+			return 0;
 		    }
 		    else if (nondigit) goto trailing_uc;
 		    set_yylval_literal(rb_cstr_to_inum(tok(), 16, FALSE));
@@ -6947,6 +6948,7 @@ parser_yylex(struct parser_params *parser)
 		    tokfix();
 		    if (toklen() == start) {
 			yyerror("numeric literal without digits");
+			return 0;
 		    }
 		    else if (nondigit) goto trailing_uc;
 		    set_yylval_literal(rb_cstr_to_inum(tok(), 2, FALSE));
@@ -6971,6 +6973,7 @@ parser_yylex(struct parser_params *parser)
 		    tokfix();
 		    if (toklen() == start) {
 			yyerror("numeric literal without digits");
+			return 0;
 		    }
 		    else if (nondigit) goto trailing_uc;
 		    set_yylval_literal(rb_cstr_to_inum(tok(), 10, FALSE));
@@ -6985,6 +6988,7 @@ parser_yylex(struct parser_params *parser)
 		    c = nextc();
 		    if (c == -1 || c == '_' || !ISDIGIT(c)) {
 			yyerror("numeric literal without digits");
+			return 0;
 		    }
 		}
 		if (c >= '0' && c <= '7') {