diff --git a/arch/x86/lib/mrccache.c b/arch/x86/lib/mrccache.c
index ec0d2cb..6dd3b5e 100644
--- a/arch/x86/lib/mrccache.c
+++ b/arch/x86/lib/mrccache.c
@@ -112,6 +112,9 @@
 	ulong base_addr;
 	int ret;
 
+	if (!is_mrc_cache(cur))
+		return -EINVAL;
+
 	/* Find the last used block */
 	base_addr = (1ULL << 32) - CONFIG_ROM_SIZE + entry->offset;
 	debug("Updating MRC cache data\n");