diff --git a/modules/highgui/src/window_gtk.cpp b/modules/highgui/src/window_gtk.cpp
index 91a59d2288..94337d27e9 100644
--- a/modules/highgui/src/window_gtk.cpp
+++ b/modules/highgui/src/window_gtk.cpp
@@ -1632,7 +1632,7 @@ static gboolean icvOnKeyPress(GtkWidget* widget, GdkEventKey* event, gpointer us
         break;
     case GDK_Return:
     case GDK_Linefeed:
-        code = '\n';
+        code = 13;
         break;
     case GDK_Tab:
         code = '\t';