diff --git a/libraries/USB/src/USBHIDKeyboard.h b/libraries/USB/src/USBHIDKeyboard.h
index 7e0201688c8..4f72742314e 100644
--- a/libraries/USB/src/USBHIDKeyboard.h
+++ b/libraries/USB/src/USBHIDKeyboard.h
@@ -63,6 +63,7 @@ typedef union {
 #define KEY_DOWN_ARROW  0xD9
 #define KEY_LEFT_ARROW  0xD8
 #define KEY_RIGHT_ARROW 0xD7
+#define KEY_SPACE       0x20
 #define KEY_BACKSPACE   0xB2
 #define KEY_TAB         0xB3
 #define KEY_RETURN      0xB0