diff --git a/http_parser.h b/http_parser.h
index 7d46cdf..02cb8ad 100644
--- a/http_parser.h
+++ b/http_parser.h
@@ -67,6 +67,11 @@ typedef int (*http_cb) (http_parser*);
 
 enum http_parser_type { HTTP_REQUEST, HTTP_RESPONSE };
 
+#define HTTP_VERSION_OTHER 0x00
+#define HTTP_VERSION_11    0x01
+#define HTTP_VERSION_10    0x02
+#define HTTP_VERSION_09    0x04
+
 struct http_parser {
   /** PRIVATE **/
   int cs;
@@ -111,8 +116,7 @@ struct http_parser {
   unsigned short status_code; /* responses only */
   unsigned short method;      /* requests only */
   short transfer_encoding;
-  unsigned short version_major;
-  unsigned short version_minor;
+  short version;
   short keep_alive;
   size_t content_length;
 
@@ -148,10 +152,7 @@ int http_parser_has_error (http_parser *parser);
 static inline int
 http_parser_should_keep_alive (http_parser *parser)
 {
-  if (parser->keep_alive == -1) {
-    if (parser->version_major == 1) return (parser->version_minor != 0);
-    return 0;
-  }
+  if (parser->keep_alive == -1) return (parser->version == HTTP_VERSION_11);
   return parser->keep_alive;
 }
 
diff --git a/http_parser.rl b/http_parser.rl
index 8cc6118..5bc21db 100644
--- a/http_parser.rl
+++ b/http_parser.rl
@@ -73,8 +73,7 @@ do {                                                                 \
   parser->status_code = 0;                                           \
   parser->method = 0;                                                \
   parser->transfer_encoding = HTTP_IDENTITY;                         \
-  parser->version_major = 0;                                         \
-  parser->version_minor = 0;                                         \
+  parser->version = HTTP_VERSION_OTHER;                              \
   parser->keep_alive = -1;                                           \
   parser->content_length = 0;                                        \
   parser->body_read = 0
@@ -242,15 +241,9 @@ do {                                                                 \
   action set_keep_alive { parser->keep_alive = 1; }
   action set_not_keep_alive { parser->keep_alive = 0; }
 
-  action version_major {
-    parser->version_major *= 10;
-    parser->version_major += *p - '0';
-  }
-
-  action version_minor {
-    parser->version_minor *= 10;
-    parser->version_minor += *p - '0';
-  }
+  action version_11 { parser->version = HTTP_VERSION_11; }
+  action version_10 { parser->version = HTTP_VERSION_10; }
+  action version_09 { parser->version = HTTP_VERSION_09; }
 
   action add_to_chunk_size {
     parser->chunk_size *= 16;
@@ -344,7 +337,11 @@ do {                                                                 \
            | "UNLOCK"    %{ parser->method = HTTP_UNLOCK;    }
            ); # Not allowing extension methods
 
-  HTTP_Version = "HTTP/" digit $version_major "." digit $version_minor;
+  HTTP_Version = "HTTP/" ( "1.1" %version_11
+                         | "1.0" %version_10
+                         | "0.9" %version_09
+                         | (digit "." digit)
+                         );
 
   scheme = ( alpha | digit | "+" | "-" | "." )* ;
   absolute_uri = (scheme ":" (uchar | reserved )*);