diff --git a/platform.d b/platform.d
index 9a0bc48..b207155 100644
--- a/platform.d
+++ b/platform.d
@@ -133,7 +133,7 @@ enum Input : u32
 	// Mouse
 	MouseMotion = 0x147,
 
-	LeftClick = 0x148, MiddleClick = 0x149, RightClick = 0x14A,
+	LeftClick = 0x148, MiddleClick = 0x149, RightClick = 0x14A, ScrollUp = 0x14B, ScrollDown = 0x14C,
 };
 
 alias I = Input;
@@ -1282,6 +1282,8 @@ HandleEvents(void* window_ptr)
 						case Button1: input = Input.LeftClick;   break;
 						case Button2: input = Input.MiddleClick; break;
 						case Button3: input = Input.RightClick;  break;
+						case Button4: input = Input.ScrollUp;    break;
+						case Button5: input = Input.ScrollDown;  break;
 						default: break;
 					}