Fix make distcheck
diff --git a/src/Makefile.am b/src/Makefile.am
index 7bcdb5e..fe14287 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -234,6 +234,7 @@
 libharfbuzz_fuzzing_la_LDFLAGS = $(libharfbuzz_la_LDFLAGS)
 libharfbuzz_fuzzing_la_LIBADD = $(libharfbuzz_la_LIBADD)
 EXTRA_libharfbuzz_fuzzing_la_DEPENDENCIES = $(EXTRA_libharfbuzz_la_DEPENDENCIES)
+CLEANFILES += libharfbuzz-fuzzing.la
 
 if HAVE_ICU
 lib_LTLIBRARIES += libharfbuzz-icu.la