diff --git a/lib/libthread_db/Makefile b/lib/libthread_db/Makefile
index f74e49d1101..eb717252800 100644
--- a/lib/libthread_db/Makefile
+++ b/lib/libthread_db/Makefile
@@ -6,7 +6,6 @@ LIB=	thread_db
 SHLIB_MAJOR= 2
 SRCS=	thread_db.c
 SRCS+=	libpthread_db.c libpthread_md.c
-SRCS+=	libc_r_db.c libc_r_md.c
 SRCS+=	libthr_db.c
 INCS=	thread_db.h
 WARNS?= 1