diff --git a/usr.sbin/acpi/acpidb/Makefile b/usr.sbin/acpi/acpidb/Makefile
--- a/usr.sbin/acpi/acpidb/Makefile
+++ b/usr.sbin/acpi/acpidb/Makefile
@@ -90,3 +90,7 @@
 .if ${COMPILER_TYPE} == "clang"
 CWARNFLAGS+=	-Wno-null-pointer-arithmetic
 .endif
+
+# AcpiUtInitStackPtrTrace intentionally leaks a pointer to an
+# on-stack variable.
+CWARNFLAGS.utdebug.c+= ${NO_WDANGLING_POINTER}
diff --git a/usr.sbin/acpi/iasl/Makefile b/usr.sbin/acpi/iasl/Makefile
--- a/usr.sbin/acpi/iasl/Makefile
+++ b/usr.sbin/acpi/iasl/Makefile
@@ -147,4 +147,8 @@
 prparser.y.h: prparserparse.h .NOMETA
 	ln -f ${.ALLSRC} ${.TARGET}
 
+# AcpiUtInitStackPtrTrace intentionally leaks a pointer to an
+# on-stack variable.
+CWARNFLAGS.utdebug.c+= ${NO_WDANGLING_POINTER}
+
 .include <bsd.prog.mk>