diff --git a/src/interfaces/ecpg/Makefile b/src/interfaces/ecpg/Makefile
index 2637a2ed01..dcdabf17eb 100644
--- a/src/interfaces/ecpg/Makefile
+++ b/src/interfaces/ecpg/Makefile
@@ -11,3 +11,4 @@ clean distclean maintainer-clean:
 	-$(MAKE) -C include $@
 	-$(MAKE) -C lib $@
 	-$(MAKE) -C preproc $@
+	-$(MAKE) -C test clean