diff --git a/src/win32_window.c b/src/win32_window.c
index 781aeda26..a667911d2 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -619,7 +619,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
             case WT_PROXIMITY:
             {
-                _glfwInputPenTabletProximity(lParam != 0);
+                _glfwInputPenTabletProximity(LOWORD(lParam));
             }
 
             case WT_PACKET: