diff --git a/scripts/dtc/checks.c b/scripts/dtc/checks.c
index 5adfc8f52b4f..4b72b530c84f 100644
--- a/scripts/dtc/checks.c
+++ b/scripts/dtc/checks.c
@@ -873,7 +873,7 @@ static void check_simple_bus_reg(struct check *c, struct dt_info *dti, struct no
 	while (size--)
 		reg = (reg << 32) | fdt32_to_cpu(*(cells++));
 
-	snprintf(unit_addr, sizeof(unit_addr), "%lx", reg);
+	snprintf(unit_addr, sizeof(unit_addr), "%zx", reg);
 	if (!streq(unitname, unit_addr))
 		FAIL(c, dti, "Node %s simple-bus unit address format error, expected \"%s\"",
 		     node->fullpath, unit_addr);