diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
index 8a9cf20beef..a4301ebdab4 100644
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -51,6 +51,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20240422: remove improperly installed libcxxrt.so.1
+OLD_LIBS+=usr/lib/libcxxrt.so.1
+
 # 20240414: unix_socketpair_test renamed
 OLD_FILES+=usr/tests/sys/kern/unix_socketpair_test
 
diff --git a/lib/libcxxrt/Makefile b/lib/libcxxrt/Makefile
index 57f41e9bf59..afae306e7bb 100644
--- a/lib/libcxxrt/Makefile
+++ b/lib/libcxxrt/Makefile
@@ -1,10 +1,11 @@
+SHLIBDIR?=	/lib
+
 .include <bsd.own.mk>
 
 PACKAGE=	clibs
 SRCDIR=		${SRCTOP}/contrib/libcxxrt
 
 SHLIB_MAJOR=	1
-SHLIBDIR?=	/lib
 
 .PATH: ${SRCDIR}