diff --git a/projects/libsndfile/build.sh b/projects/libsndfile/build.sh
index 77d3f65da..fc0a8ebcc 100755
--- a/projects/libsndfile/build.sh
+++ b/projects/libsndfile/build.sh
@@ -17,3 +17,9 @@
 
 # Run the OSS-Fuzz script in the project.
 ./ossfuzz/ossfuzz.sh
+
+# To make CIFuzz fast, see here for details: https://github.com/libsndfile/libsndfile/pull/796
+for fuzzer in sndfile_alt_fuzzer sndfile_fuzzer; do
+  echo "[libfuzzer]" > ${OUT}/${fuzzer}.options
+  echo "close_fd_mask = 3" >> ${OUT}/${fuzzer}.options
+done