diff --git a/sys/x86/x86/ucode_subr.c b/sys/x86/x86/ucode_subr.c
--- a/sys/x86/x86/ucode_subr.c
+++ b/sys/x86/x86/ucode_subr.c
@@ -98,11 +98,11 @@
     const uint8_t *fw_data, size_t fw_size, size_t *selected_sizep)
 {
 	const amd_10h_fw_header_t *fw_header;
-	const amd_10h_fw_header_t *selected_fw;
+	const amd_10h_fw_header_t *selected_fw = NULL;
 	const equiv_cpu_entry_t *equiv_cpu_table;
 	const section_header_t *section_header;
 	const container_header_t *container_header;
-	size_t selected_size;
+	size_t selected_size = 0;
 	uint16_t equiv_id;
 	int i;