diff --git a/poxml/antlr/antlr/CharScanner.h b/poxml/antlr/antlr/CharScanner.h
index a2537964..82766f1f 100644
--- a/poxml/antlr/antlr/CharScanner.h
+++ b/poxml/antlr/antlr/CharScanner.h
@@ -49,7 +49,7 @@ ANTLR_BEGIN_NAMESPACE(antlr)
 
 class CharScanner;
 
-class CharScannerLiteralsLess : public ANTLR_USE_NAMESPACE(std)binary_function<ANTLR_USE_NAMESPACE(std)string,ANTLR_USE_NAMESPACE(std)string,bool> {
+class CharScannerLiteralsLess : public ANTLR_USE_NAMESPACE(std)function<bool(ANTLR_USE_NAMESPACE(std)string,ANTLR_USE_NAMESPACE(std)string)> {
 private:
 	const CharScanner* scanner;
 public: