diff --git a/third_party/libtiff/tif_error.c b/third_party/libtiff/tif_error.c
index ac0b9c373..3d320eeff 100644
--- a/third_party/libtiff/tif_error.c
+++ b/third_party/libtiff/tif_error.c
@@ -29,6 +29,9 @@
 
 TIFFErrorHandlerExt _TIFFerrorHandlerExt = NULL;
 
+TIFFErrorHandler _TIFFwarningHandler = NULL;
+TIFFErrorHandler _TIFFerrorHandler = NULL;
+
 TIFFErrorHandler TIFFSetErrorHandler(TIFFErrorHandler handler)
 {
     TIFFErrorHandler prev = _TIFFerrorHandler;