diff --git a/main.py b/main.py
index 09053de..f3cecb9 100644
--- a/main.py
+++ b/main.py
@@ -38,6 +38,10 @@ HC_ACTION = 0
 VK_F12 = 0x7B
 VK_CONTROL = 0x11
 VK_SHIFT = 0x10
+VK_LSHIFT = 0xA0
+VK_RSHIFT = 0xA1
+VK_LCONTROL = 0xA2
+VK_RCONTROL = 0xA3
 
 LLKHF_INJECTED = 0x10
 LLMHF_INJECTED = 0x01
@@ -130,14 +134,14 @@ def keyboard_proc(n_code, w_param, l_param):
         injected = (kb.flags & LLKHF_INJECTED) != 0
         if not injected:
             if w_param in (WM_KEYDOWN, WM_SYSKEYDOWN):
-                if kb.vkCode == VK_CONTROL:
+                if kb.vkCode in (VK_CONTROL, VK_LCONTROL, VK_RCONTROL):
                     ctrl_down = True
-                elif kb.vkCode == VK_SHIFT:
+                elif kb.vkCode in (VK_SHIFT, VK_LSHIFT, VK_RSHIFT):
                     shift_down = True
             elif w_param in (WM_KEYUP, WM_SYSKEYUP):
-                if kb.vkCode == VK_CONTROL:
+                if kb.vkCode in (VK_CONTROL, VK_LCONTROL, VK_RCONTROL):
                     ctrl_down = False
-                elif kb.vkCode == VK_SHIFT:
+                elif kb.vkCode in (VK_SHIFT, VK_LSHIFT, VK_RSHIFT):
                     shift_down = False
         if cat_mode and not injected:
             # Emergency unlock combo: Ctrl+Shift+F12