diff --git a/http_parser.h b/http_parser.h
index afcb481..9c7a26d 100644
--- a/http_parser.h
+++ b/http_parser.h
@@ -24,6 +24,8 @@
 extern "C" {
 #endif
 
+#define HTTP_PARSER_VERSION_MAJOR 1
+#define HTTP_PARSER_VERSION_MINOR 0
 
 #include <sys/types.h>
 #if defined(_WIN32) && !defined(__MINGW32__)