diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 7bbc739d4..3042b80a7 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -896,6 +896,7 @@ void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
             //Dbprintf("DEBUG: No Tag");
         }
         WDT_HIT();
+        hi = 0;
         lo = 0;
         clk=0;
         invert=0;