diff --git a/websocketpp/http/constants.hpp b/websocketpp/http/constants.hpp
index 52027cd366..a687f27c15 100644
--- a/websocketpp/http/constants.hpp
+++ b/websocketpp/http/constants.hpp
@@ -62,7 +62,7 @@ namespace http {
     };
     
     inline bool is_token_char(unsigned char c) {
-    	return HEADER_TOKEN[c];
+    	return (HEADER_TOKEN[c] == 1);
     }
     
     inline bool is_not_token_char(unsigned char c) {