diff --git a/libs/pyglet/gl/win32.py b/libs/pyglet/gl/win32.py
index 6cef71a..6e5b67f 100644
--- a/libs/pyglet/gl/win32.py
+++ b/libs/pyglet/gl/win32.py
@@ -244,7 +244,7 @@ class Win32ARBContext(_BaseWin32Context):
         if self.config.forward_compatible:
             flags |= wglext_arb.WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
         if self.config.debug:
-            flags |= wglext_arb.WGL_DEBUG_BIT_ARB
+            flags |= wglext_arb.WGL_CONTEXT_DEBUG_BIT_ARB
         if flags:
             attribs.extend([wglext_arb.WGL_CONTEXT_FLAGS_ARB, flags])
         attribs.append(0)