diff --git a/libwccl/parser/Parser.cpp b/libwccl/parser/Parser.cpp
index 1cc17fa319b27d717ecea5350c02d71fb6f306f3..c314933f5f64cb1cb5b14746dc4a29c4808dc4a2 100644
--- a/libwccl/parser/Parser.cpp
+++ b/libwccl/parser/Parser.cpp
@@ -137,7 +137,7 @@ boost::shared_ptr<ANTLRParserResultBase> Parser::parseAnyOperator(
 {
 	boost::shared_ptr<ANTLRParserResultBase> result;
 	if (!result) {
-		istr.seekg(0, std::ios::beg);
+		istr.seekg(0);
 		ANTLRLexer lexer(istr);
 		ANTLRParser parser(lexer);
 		try {
@@ -147,7 +147,8 @@ boost::shared_ptr<ANTLRParserResultBase> Parser::parseAnyOperator(
 		}
 	}
 	if (!result) {
-		istr.seekg(0, std::ios::beg);
+		istr.clear();
+		istr.seekg(0);
 		ANTLRLexer lexer(istr);
 		ANTLRParser parser(lexer);
 		try {
@@ -157,7 +158,8 @@ boost::shared_ptr<ANTLRParserResultBase> Parser::parseAnyOperator(
 		}
 	}
 	if (!result) {
-		istr.seekg(0, std::ios::beg);
+		istr.clear();
+		istr.seekg(0);
 		ANTLRLexer lexer(istr);
 		ANTLRParser parser(lexer);
 		try {