diff --git a/src/utilities/mf_hlflash.c b/src/utilities/mf_hlflash.c
index 8259bb8b5..ee67bad31 100644
--- a/src/utilities/mf_hlflash.c
+++ b/src/utilities/mf_hlflash.c
@@ -22,7 +22,7 @@
 
 uint8_t mfhf_slot_mb = 1;
 uint32_t mfhf_slot_size = 1L << 20;
-uint8_t mfhf_slot0_erase_list[16];
+uint8_t mfhf_slot0_erase_list[16] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
 uint8_t mfhf_core_file_state = MFHF_LC_NOTLOADED;