diff --git a/lib/Makefile b/lib/Makefile
index 1f6ca1bacf67..b57bec001418 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -66,18 +66,12 @@ _libvgl=	libvgl
 .if !defined(NOLIBPTHREAD)
 _libpthread=	libpthread
 .endif
-.if !defined(NOLIBTHR)
-_libthr=	libthr
-.endif
 .endif
 
 .if ${MACHINE_ARCH} == "ia64"
 .if !defined(NOLIBPTHREAD)
 _libpthread=	libpthread
 .endif
-.if !defined(NOLIBTHR)
-_libthr=	libthr
-.endif
 .endif
 
 .if ${MACHINE_ARCH} == "alpha"
@@ -85,6 +79,12 @@ _libio=		libio
 _compat=	compat
 .endif
 
+.if ${MACHINE_ARCH} != "amd64" && ${MACHINE_ARCH} != "powerpc"
+.if !defined(NOLIBTHR)
+_libthr=	libthr
+.endif
+.endif
+
 .if ${MACHINE_ARCH} != "powerpc"
 _libdisk=	libdisk
 .endif