diff --git a/lib/libthr/Makefile b/lib/libthr/Makefile
--- a/lib/libthr/Makefile
+++ b/lib/libthr/Makefile
@@ -13,8 +13,6 @@
 LIB=thr
 SHLIB_MAJOR= 3
 
-LIBADD=	sys
-
 NO_WTHREAD_SAFETY=1
 NO_WCAST_ALIGN.gcc=1    # for gcc 4.2
 CFLAGS+=-DPTHREAD_KERNEL
@@ -47,6 +45,7 @@
 .endif
 
 LDFLAGS+=-Wl,-znodelete
+LDFLAGS+=-Wl,--auxiliary,libsys.so.7
 
 VERSION_DEF=${SRCTOP}/lib/libc/Versions.def
 SYMBOL_MAPS=${.CURDIR}/pthread.map
@@ -76,7 +75,7 @@
 .else
 .PATH: ${LIBSYS_SRCTOP}
 .endif
-STATICOBJS+=	_umtx_op_err.o
+OBJS+=	_umtx_op_err.o
 
 .if ${MK_INSTALLLIB} != "no"
 SYMLINKS+=lib${LIB}.a ${LIBDIR}/libpthread.a
diff --git a/lib/libthr/pthread.map b/lib/libthr/pthread.map
--- a/lib/libthr/pthread.map
+++ b/lib/libthr/pthread.map
@@ -298,6 +298,9 @@
 
 	/* ABI bug workaround, indicate that pli->rtli_version is valid */
 	_pli_rtli_version;
+
+	/* Expose stub for libsys filter */
+	_umtx_op_err;
 };
 
 FBSD_1.1 {