diff --git a/contrib/oss-fuzz/libpng_read_fuzzer.cc b/contrib/oss-fuzz/libpng_read_fuzzer.cc
index 2893f6148..6566bff30 100644
--- a/contrib/oss-fuzz/libpng_read_fuzzer.cc
+++ b/contrib/oss-fuzz/libpng_read_fuzzer.cc
@@ -5,7 +5,7 @@
 // Use of this source code is governed by a BSD-style license that may
 // be found in the LICENSE file https://cs.chromium.org/chromium/src/LICENSE
 
-// Last changed in libpng 1.6.35 [October 14, 2017]
+// Last changed in libpng 1.6.35 [October 30, 2017]
 
 // The modifications in 2017 by Glenn Randers-Pehrson include
 // 1. addition of a PNG_CLEANUP macro,
@@ -166,7 +166,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   png_set_expand(png_handler.png_ptr);
   png_set_packing(png_handler.png_ptr);
   png_set_scale_16(png_handler.png_ptr);
-  png_set_add_alpha(png_handler.png_ptr, 0xffff, PNG_FILLER_AFTER);
+  png_set_tRNS_to_alpha(png_handler.png_ptr);
 
   int passes = png_set_interlace_handling(png_handler.png_ptr);