diff --git a/projects/libass/Dockerfile b/projects/libass/Dockerfile
index 325f64811..a0828d93f 100644
--- a/projects/libass/Dockerfile
+++ b/projects/libass/Dockerfile
@@ -21,4 +21,4 @@ RUN apt-get update && apt-get install -y make autoconf automake libtool pkg-conf
 RUN git clone --depth 1 https://github.com/libass/libass.git
 RUN git clone --depth 1 https://github.com/harfbuzz/harfbuzz.git
 
-COPY build.sh libass_fuzzer.cc *.dict *.options $SRC/
+COPY build.sh *.options $SRC/
diff --git a/projects/libass/ass.dict b/projects/libass/ass.dict
deleted file mode 100644
index aa4f9b43f..000000000
--- a/projects/libass/ass.dict
+++ /dev/null
@@ -1,112 +0,0 @@
-"0x"
-"\\1a"
-"\\2a"
-"\\2c"
-"\\3a"
-"\\3c"
-"\\4a"
-"\\4c"
-"\\a"
-"\\alpha"
-"\\an"
-"Arial"
-"\\b"
-"Banner;"
-"\\be"
-"\\blur"
-"\\bord"
-"\\c"
-"CFF"
-"CID Type 1"
-"\\clip"
-"clip"
-"Courier"
-"Courier New"
-"Default"
-"Dialogue:"
-"[Events]"
-"\\fade"
-"\\fax"
-"\\fay"
-"\\fe"
-"\\fn"
-"fontname:"
-"[Fonts]"
-"Format:"
-"\\frx"
-"\\fry"
-"\\frz"
-"\\fs"
-"\\fsc"
-"\\fscx"
-"\\fscy"
-"\\fsp"
-"&h"
-"Helvetica"
-"\\i"
-"\\iclip"
-"iclip"
-"\\k"
-"Kerning:"
-"Kerning"
-"\\kf"
-"\\ko"
-"Language:"
-"monospace"
-"\\move"
-"move"
-"none"
-"\\org"
-"org"
-"OverrideStyle"
-"\\p"
-"p"
-"\\pbo"
-"pbo"
-"pc.240m"
-"pc.601"
-"pc.709"
-"pc.fcc"
-"PlayResX:"
-"PlayResX"
-"PlayResY:"
-"PlayResY"
-"\\pos"
-"pos"
-"\\q"
-"\\r"
-"\\s"
-"sans-serif"
-"ScaledBorderAndShadow:"
-"ScaledBorderAndShadow"
-"[Script Info]"
-"Scroll down;"
-"Scroll up;"
-"serif"
-"\\shad"
-"Style:"
-"\\t"
-"Text"
-"Timer:"
-"Timer"
-"Times"
-"Times New Roman"
-"tv.240m"
-"tv.601"
-"tv.709"
-"tv.fcc"
-"Type 1"
-"Type 42"
-"\\u"
-"UTF-8"
-"[V4 Styles]"
-"[V4+ Styles]"
-"WrapStyle:"
-"WrapStyle"
-"\\xbord"
-"\\xshad"
-"\\ybord"
-"YCbCr Matrix:"
-"YCbCr Matrix"
-"yes"
-"\\yshad"
diff --git a/projects/libass/build.sh b/projects/libass/build.sh
index 8e313fdfd..e2cf17ccc 100755
--- a/projects/libass/build.sh
+++ b/projects/libass/build.sh
@@ -38,14 +38,9 @@ cd $SRC/libass
 
 export PKG_CONFIG_PATH=/work/lib/pkgconfig
 ./autogen.sh
-./configure --disable-asm
-make -j$(nproc)
+./configure FUZZ_CPPFLAGS="-DASS_FUZZMODE=2" --disable-asm --disable-shared --enable-fuzz
+make -j "$(nproc)" fuzz/fuzz_ossfuzz
+cp fuzz/fuzz_ossfuzz $OUT/libass_fuzzer
+cp fuzz/ass.dict $OUT/ass.dict
 
-$CXX $CXXFLAGS -std=c++11 -I$SRC/libass \
-    $SRC/libass_fuzzer.cc -o $OUT/libass_fuzzer \
-    $LIB_FUZZING_ENGINE libass/.libs/libass.a \
-    -Wl,-Bstatic \
-    $(pkg-config --static --libs fontconfig freetype2 fribidi harfbuzz | sed 's/-lm //g') \
-    -Wl,-Bdynamic
-
-cp $SRC/*.dict $SRC/*.options $OUT/
+cp $SRC/*.options $OUT/
diff --git a/projects/libass/libass_fuzzer.cc b/projects/libass/libass_fuzzer.cc
deleted file mode 100644
index 8cb11a68c..000000000
--- a/projects/libass/libass_fuzzer.cc
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
-# Copyright 2021 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-################################################################################
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <libass/ass.h>
-
-static ASS_Library *ass_library;
-static ASS_Renderer *ass_renderer;
-
-void msg_callback(int level, const char *fmt, va_list va, void *data) {
-}
-
-static const int kFrameWidth = 1280;
-static const int kFrameHeight = 720;
-
-struct init {
-  init(int frame_w, int frame_h) {
-    ass_library = ass_library_init();
-    if (!ass_library) {
-      printf("ass_library_init failed!\n");
-      exit(1);
-    }
-
-    ass_set_message_cb(ass_library, msg_callback, NULL);
-
-    ass_renderer = ass_renderer_init(ass_library);
-    if (!ass_renderer) {
-      printf("ass_renderer_init failed!\n");
-      exit(1);
-    }
-
-    ass_set_frame_size(ass_renderer, frame_w, frame_h);
-    ass_set_fonts(ass_renderer, nullptr, "sans-serif",
-                  ASS_FONTPROVIDER_AUTODETECT, nullptr, 1);
-  }
-
-  ~init() {
-    ass_renderer_done(ass_renderer);
-    ass_library_done(ass_library);
-  }
-};
-
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-  static init initialized(kFrameWidth, kFrameHeight);
-
-  ASS_Track *track = ass_read_memory(ass_library, (char *)data, size, nullptr);
-  if (!track) return 0;
-
-  for (int i = 0; i < track->n_events; ++i) {
-    ASS_Event &ev = track->events[i];
-    long long tm = ev.Start + ev.Duration / 2;
-    ass_render_frame(ass_renderer, track, tm, nullptr);
-  }
-  ass_free_track(track);
-  return 0;
-}