diff --git a/projects/libpng/Dockerfile b/projects/libpng/Dockerfile
index 690b357d3..61a6fda5e 100644
--- a/projects/libpng/Dockerfile
+++ b/projects/libpng/Dockerfile
@@ -18,6 +18,6 @@ FROM ossfuzz/base-builder
 MAINTAINER mmoroz@chromium.org
 RUN apt-get install -y make autoconf automake libtool zlib1g-dev
 
-RUN git clone --depth 1 git://git.code.sf.net/p/libpng/code libpng
+RUN git clone --depth 1 https://github.com/glennrp/libpng.git
 WORKDIR libpng
 COPY build.sh libpng_read_fuzzer.* png.dict $SRC/
diff --git a/projects/libpng/build.sh b/projects/libpng/build.sh
index 0b208fc41..7a80da597 100755
--- a/projects/libpng/build.sh
+++ b/projects/libpng/build.sh
@@ -26,9 +26,12 @@ autoreconf -f -i
 make -j$(nproc) clean
 make -j$(nproc) all
 
-# build libpng_read_fuzzer
+# build libpng_read_fuzzer.
 $CXX $CXXFLAGS -std=c++11 -I. -lz \
      $SRC/libpng_read_fuzzer.cc -o $OUT/libpng_read_fuzzer \
      -lFuzzingEngine .libs/libpng16.a
 
+# add seed corpus.
+find $SRC/libpng -name "*.png" | xargs zip $OUT/libpng_read_fuzzer_seed_corpus.zip
+
 cp $SRC/*.dict $SRC/*.options $OUT/