diff --git a/parser.go b/parser.go
index a8368f4..eb5108e 100644
--- a/parser.go
+++ b/parser.go
@@ -336,6 +336,7 @@ func (parser *parser) parseItem(scanner *scanner, allowVarRef bool, termSymbols
 }
 
 func (parser *parser) Parse(scanner *scanner, termSymbols ...Symbol) (tree *ast, err error) {
+	termSymbols = append(termSymbols, SymEos)
 	return parser.parseGeneral(scanner, true, false, termSymbols...)
 }
 
@@ -487,6 +488,10 @@ func (parser *parser) parseGeneral(scanner *scanner, allowForest bool, allowVarR
 		// lastSym = tk.Sym
 	}
 
+	if err == nil && !tk.IsOneOf(termSymbols) {
+		err = tk.ErrorExpectedGotStringWithPrefix("expected one of", SymListToString(termSymbols, false), SymToString(tk.Sym))
+	}
+
 	if err == nil {
 		err = tk.Error()
 	}