diff --git a/res/Makefile b/res/Makefile
index fdfd1e0740..9feaed84c4 100644
--- a/res/Makefile
+++ b/res/Makefile
@@ -54,6 +54,7 @@ clean-depend:
 
 clean: clean-depend
 	rm -f *.so *.o
+	rm -f snmp/*.o
 
 res_odbc.so: res_odbc.o
 	$(CC) $(SOLINK) -o $@ $< $(ODBC_LIB)