diff --git a/json_tokener.c b/json_tokener.c
index a2a598b..4ebe712 100644
--- a/json_tokener.c
+++ b/json_tokener.c
@@ -74,7 +74,7 @@ const char* json_tokener_errors[] = {
 const char *json_tokener_error_desc(enum json_tokener_error jerr)
 {
 	int jerr_int = (int)jerr;
-	if (jerr_int < 0 || jerr_int > (int)(sizeof(json_tokener_errors) / sizeof(json_tokener_errors[0])))
+	if (jerr_int < 0 || jerr_int >= (int)(sizeof(json_tokener_errors) / sizeof(json_tokener_errors[0])))
 		return "Unknown error, invalid json_tokener_error value passed to json_tokener_error_desc()";
 	return json_tokener_errors[jerr];
 }