diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
index c32f3b7540e872597e8d286238bbf08bfacb0d08..76b381cf70b27fe1496f05dd3bd32c153737c42f 100644
--- a/drivers/pci/pci-label.c
+++ b/drivers/pci/pci-label.c
@@ -145,7 +145,7 @@ static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf)
 	len = utf16s_to_utf8s((const wchar_t *)obj->buffer.pointer,
 			      obj->buffer.length,
 			      UTF16_LITTLE_ENDIAN,
-			      buf, PAGE_SIZE);
+			      buf, PAGE_SIZE - 1);
 	buf[len] = '\n';
 }