diff --git a/common/lfdemod.c b/common/lfdemod.c
index ee6d6afe0..89910488d 100644
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -1537,6 +1537,11 @@ static uint16_t cleanAskRawDemod(uint8_t *bits, size_t *size, int clk, int inver
     getNextHigh(bits, *size, high, &pos);
 //    getNextLow(bits, *size, low, &pos);
 
+    // do not skip first transition
+    if ((pos > cl_2 - cl_4 - 1) && (pos <= clk + cl_4 + 1)) {
+        bits[bitCnt++] = invert ^ 1;
+    }
+    
     // sample counts,   like clock = 32.. it tries to find  32/4 = 8,  32/2 = 16
     for (size_t i = pos; i < *size; i++) {
         if (bits[i] >= high && waveHigh) {