diff --git a/src/boot/efi/log.c b/src/boot/efi/log.c
index 93631aca94..dd651bf18e 100644
--- a/src/boot/efi/log.c
+++ b/src/boot/efi/log.c
@@ -79,6 +79,9 @@ void __stack_chk_guard_init(void) {
         EFI_RNG_PROTOCOL *rng;
         if (BS->LocateProtocol(MAKE_GUID_PTR(EFI_RNG_PROTOCOL), NULL, (void **) &rng) == EFI_SUCCESS)
                 (void) rng->GetRNG(rng, NULL, sizeof(__stack_chk_guard), (void *) &__stack_chk_guard);
+        else
+                /* Better than no extra entropy. */
+                __stack_chk_guard ^= (intptr_t) &__ImageBase;
 }
 #endif