diff --git a/include/SFML/Window/Keyboard.h b/include/SFML/Window/Keyboard.h
index 382081c..fff494b 100644
--- a/include/SFML/Window/Keyboard.h
+++ b/include/SFML/Window/Keyboard.h
@@ -36,6 +36,7 @@
 ////////////////////////////////////////////////////////////
 typedef enum
 {
+    sfKeyUnknown = -1, ///< Unhandled key
     sfKeyA,            ///< The A key
     sfKeyB,            ///< The B key
     sfKeyC,            ///< The C key