diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh
index cf7dc646484f2f699021d9d6cc068925e92444f7..ed72b56a977de02f932d51b247e39c27d995caba 100755
--- a/.clusterfuzzlite/build.sh
+++ b/.clusterfuzzlite/build.sh
@@ -15,6 +15,7 @@ meson setup "$BUILD" \
   -Dfuzzer_ldflags="$LIB_FUZZING_ENGINE" \
   -Ddebug_level=0 \
   -Ddefault_library=static \
+  -Db_lundef=false \
   --wrap-mode=nodownload
 
 # build fuzzers