diff --git a/client/src/cmdhfmf.c b/client/src/cmdhfmf.c
index 8f70b5b01..e3aeec83e 100644
--- a/client/src/cmdhfmf.c
+++ b/client/src/cmdhfmf.c
@@ -875,7 +875,7 @@ static int mf_analyse_st_block(uint8_t blockno, uint8_t *block, bool force) {
         if (mfReadOnlyAccessConditions(foo, &block[6])) {
         // WARNING: Sectors 33+ assume ACLs apply to groups of 4 blocks, not 1 block.
         // The code as-is is bugged and actually wastes iterations. If you have 16 blocks, it'll run all 16 but only error out like it's a 4-block sector.
-            if (blockno<127)
+            if (blockno<128)
                 PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on block " _YELLOW_("%u") " detected", blockno - bar + 1 + foo);
             else
                 PrintAndLogEx(WARNING, "Strict ReadOnly Access Conditions on blocks " _YELLOW_("%u-%u") " detected", blockno - bar*4 + 1 + foo*5, blockno - bar*4 + 1 + foo*5 + 4);