diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig
index 6ec71a9..46cfe8b 100644
--- a/arch/sandbox/Kconfig
+++ b/arch/sandbox/Kconfig
@@ -1,3 +1,5 @@
+source "scripts/Kconfig.include"
+
 config SANDBOX
 	bool
 	select OFTREE
@@ -20,3 +22,10 @@
 	default y
 	select ARCH_HAS_STACK_DUMP
 	depends on UBSAN || KASAN
+
+config CC_IS_64BIT
+	def_bool $(success,$(srctree)/scripts/gcc-64bitptr.sh $(CC))
+
+config 64BIT
+	bool
+	default CC_IS_64BIT
diff --git a/scripts/gcc-64bitptr.sh b/scripts/gcc-64bitptr.sh
new file mode 100755
index 0000000..7fb0570
--- /dev/null
+++ b/scripts/gcc-64bitptr.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+cat << "END" | $@ -x c - -c -o /dev/null
+int main(void)
+{
+	return sizeof(struct { int:-!(sizeof(void *) == 8); });
+}
+END