diff --git a/fuzzers/005-tilegrid/Makefile b/fuzzers/005-tilegrid/Makefile
index 52db4f31..1ddca0ab 100644
--- a/fuzzers/005-tilegrid/Makefile
+++ b/fuzzers/005-tilegrid/Makefile
@@ -45,6 +45,7 @@ run:
 
 clean:
 	rm -rf build
+	cd iob && $(MAKE) clean
 
 .PHONY: database pushdb clean run