diff --git a/code/win32/win_glimp.cpp b/code/win32/win_glimp.cpp
index df2b5bd..5011dbb 100644
--- a/code/win32/win_glimp.cpp
+++ b/code/win32/win_glimp.cpp
@@ -1156,3 +1156,11 @@ void WIN_UpdateHardwareGammaRamp( qbool enable )
 	else
 		GLW_RestoreGamma();
 }
+
+
+void WIN_UpdateResolution( int width, int height )
+{
+	glConfig.vidWidth = width;
+	glConfig.vidHeight = height;
+}
+
diff --git a/code/win32/win_local.h b/code/win32/win_local.h
index 932f1a9..2bab90b 100644
--- a/code/win32/win_local.h
+++ b/code/win32/win_local.h
@@ -43,6 +43,7 @@ void	IN_Shutdown();
 void WIN_GetStartUpMonitorIndex();
 void WIN_GetMonitorIndexFromMainWindow();
 void WIN_UpdateHardwareGammaRamp( qbool enable );
+void WIN_UpdateResolution( int width, int height );
 
 void SNDDMA_Activate();
 
diff --git a/code/win32/win_wndproc.cpp b/code/win32/win_wndproc.cpp
index d9fba21..22d73e4 100644
--- a/code/win32/win_wndproc.cpp
+++ b/code/win32/win_wndproc.cpp
@@ -297,6 +297,10 @@ LRESULT CALLBACK MainWndProc (
 		}
 		break;
 
+	case WM_SIZE:
+		WIN_UpdateResolution( (int)LOWORD(lParam), (int)HIWORD(lParam) );
+		break;
+
 	case WM_SYSCOMMAND:
 		if ( wParam == SC_SCREENSAVE )
 			return 0;