diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 6d1c6bb9f224d9e01303f15fdadef7643075e6c5..2a48022c41e7d184660c59de87fa7dce0b345d4b 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -27,3 +27,5 @@ HOSTCFLAGS_dtc-parser.tab.o := $(HOSTCFLAGS_DTC)
 # dependencies on generated files need to be listed explicitly
 $(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h
 
+# generated files need to be cleaned explicitly
+clean-files	:= dtc-lexer.lex.c dtc-parser.tab.c dtc-parser.tab.h