diff --git a/source/Platform/Unix/X11Mouse.cpp b/source/Platform/Unix/X11Mouse.cpp
index f4bd651..3c7ccb5 100644
--- a/source/Platform/Unix/X11Mouse.cpp
+++ b/source/Platform/Unix/X11Mouse.cpp
@@ -49,7 +49,7 @@ bool X11Mouse::isButtonDown(Mouse::Button button) const
 		return m_btn_state & Button1Mask;
 	case Mouse::Button::Right :
 		return m_btn_state & Button3Mask;
-    case Mouse::Button::Middle :
+	case Mouse::Button::Middle :
 		return m_btn_state & Button2Mask;
 	case Mouse::Button::XButton1 :
 		return _priv::xstate & XBUTTON1BIT;