diff --git a/external/cddl/osnet/lib/libdtrace/Makefile b/external/cddl/osnet/lib/libdtrace/Makefile
index 1b5624ad1763..04a4d3046431 100644
--- a/external/cddl/osnet/lib/libdtrace/Makefile
+++ b/external/cddl/osnet/lib/libdtrace/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.26 2019/12/03 22:10:56 jmcneill Exp $
+#	$NetBSD: Makefile,v 1.27 2020/03/17 00:50:12 fox Exp $
 
 # $FreeBSD: head/cddl/lib/libdtrace/Makefile 314654 2017-03-04 11:30:04Z ngie $
 
@@ -94,6 +94,12 @@ COPTS.dt_options.c	+= -Wno-parentheses
 COPTS.dt_pid.c		+= ${${ACTIVE_CC} == "gcc" :? -Wno-unused-but-set-variable :}
 COPTS.dt_isadep.c	+= -Wno-unused-variable
 
+.if (${MKLIBCSANITIZER:Uno} == "yes")
+.if (${ACTIVE_CC} == "gcc" && ${HAVE_GCC:U0} == 8)
+COPTS.dt_proc.c+=	-Wno-maybe-uninitialized
+.endif
+.endif
+
 .if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "x86_64"
 CPPFLAGS+=	-I${OPENSOLARIS_SYS_DISTDIR}/uts/intel
 CPPFLAGS+=	-I${.CURDIR}/../../dev/dtrace/x86