diff --git a/gnu/lib/libstdc++/Makefile b/gnu/lib/libstdc++/Makefile
index fc450482265..365e91f7ea8 100644
--- a/gnu/lib/libstdc++/Makefile
+++ b/gnu/lib/libstdc++/Makefile
@@ -71,6 +71,7 @@ ATOMICITY_H=	${SRCDIR}/config/cpu/generic/atomicity.h
 
 atomicity.cc:	${ATOMICITY_H}
 	ln -sf ${.ALLSRC} ${.TARGET}
+CLEANFILES+=	atomicity.cc
 
 INCSGROUPS=	BITSHDRS BKWHDRS EXTHDRS BASEHDRS BASEXHDRS STDHDRS \
 		TARGETHDRS THRHDRS DEBUGHDRS