Also clean the fuzz subdirectory
diff --git a/tests/Makefile b/tests/Makefile
index d5dd193..2ca0fd6 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -164,6 +164,7 @@
 	rmdir /Q /S TESTS
 endif
 endif
+	$(MAKE) -C fuzz clean
 
 # Test suites caught by SKIP_TEST_SUITES are built but not executed.
 check: $(BINARIES)