diff --git a/swad_changelog.h b/swad_changelog.h
index d71dac71a..5926dbc80 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -170,13 +170,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.64.17 (2016-11-19)"
+#define Log_PLATFORM_VERSION	"SWAD 16.64.18 (2016-11-19)"
 #define CSS_FILE		"swad16.60.1.css"
 #define JS_FILE			"swad16.46.1.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 16.64.18: Nov 19, 2016	Input field required in search. (207312 lines)
         Version 16.64.17: Nov 19, 2016	Input field required in new attendance event form. (207310 lines)
         Version 16.64.16: Nov 19, 2016	Input field required in new survey form. (207308 lines)
         Version 16.64.15: Nov 19, 2016	Input field required in new assignment form. (207306 lines)
diff --git a/swad_search.c b/swad_search.c
index 6013ec25e..6e7c321f6 100644
--- a/swad_search.c
+++ b/swad_search.c
@@ -379,7 +379,8 @@ void Sch_PutInputStringToSearch (const char *IdInputText)
    if (!Gbl.Search.Str[0])
       fprintf (Gbl.F.Out," placeholder=\"%s…\"",
 	       Txt_Search);
-   fprintf (Gbl.F.Out," style=\"margin:0;\" />");
+   fprintf (Gbl.F.Out," style=\"margin:0;\""
+	              " required=\"required\" />");
   }
 
 /*****************************************************************************/