diff --git a/key_defs.h b/key_defs.h
index 00ce7be9..39481406 100644
--- a/key_defs.h
+++ b/key_defs.h
@@ -28,7 +28,16 @@ typedef struct {
 
 // IS_INTERNAL key table:
 
-#define LED_TOGGLE 1
+#define LED_TOGGLE  0x01 // Synthetic, internal
+
+
+// Synthetic, not internal
+#define KEY_MOUSE_BTN_L 0x01 // Synthetic key
+#define KEY_MOUSE_BTN_M 0x04 // Synthetic key
+#define KEY_MOUSE_BTN_R 0x02 // Synthetic key
+
+
+
 
 
 #define KEY_MOUSE_UP            B0000001
@@ -80,9 +89,6 @@ typedef struct {
 #define Key_mouseScrollDn
 #define Key_mouseScrollL
 #define Key_mouseScrollR
-#define KEY_MOUSE_BTN_L 0x01 // Synthetic key
-#define KEY_MOUSE_BTN_M 0x04 // Synthetic key
-#define KEY_MOUSE_BTN_R 0x02 // Synthetic key
 #define Key_mouseBtnL    (Key){ KEY_FLAGS | SYNTHETIC_KEY, KEY_MOUSE_BTN_L }
 #define Key_mouseBtnM    (Key){ KEY_FLAGS | SYNTHETIC_KEY , KEY_MOUSE_BTN_M }
 #define Key_mouseBtnR    (Key){ KEY_FLAGS | SYNTHETIC_KEY, KEY_MOUSE_BTN_R }
diff --git a/key_events.cpp b/key_events.cpp
index fecafd3d..3236b72a 100644
--- a/key_events.cpp
+++ b/key_events.cpp
@@ -3,9 +3,10 @@
 void handle_synthetic_key_event(byte switchState, Key mappedKey) {
     if (mappedKey.flags & IS_MOUSE_KEY && !( mappedKey.rawKey & KEY_MOUSE_WARP) ) {
         handle_mouse_key_event(switchState, mappedKey);
-    } else if (mappedKey.rawKey == KEY_MOUSE_BTN_L
+    } else if (! (mappedKey.flags & IS_INTERNAL)
+          && (mappedKey.rawKey == KEY_MOUSE_BTN_L
                || mappedKey.rawKey == KEY_MOUSE_BTN_M
-               || mappedKey.rawKey == KEY_MOUSE_BTN_R) {
+               || mappedKey.rawKey == KEY_MOUSE_BTN_R)) {
         if (key_toggled_on (switchState)) {
             MouseWrapper.press_button(
                 (mappedKey.rawKey ==  KEY_MOUSE_BTN_L ?  KEY_MOUSE_BUTTON_LEFT   : 0x00) |