diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index bc904c66a..ab839109f 100644
--- a/armsrc/hitag2.c
+++ b/armsrc/hitag2.c
@@ -999,7 +999,7 @@ void SimulateHitagTag(bool tag_mem_supplied, byte_t* data) {
 	
 	// Set up simulator mode, frequency divisor which will drive the FPGA
 	// and analog mux selection.
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
 	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 	SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
 	RELAY_OFF();
diff --git a/armsrc/hitagS.c b/armsrc/hitagS.c
index 45387c4f0..850922a5f 100644
--- a/armsrc/hitagS.c
+++ b/armsrc/hitagS.c
@@ -1026,7 +1026,7 @@ void SimulateHitagSTag(bool tag_mem_supplied, byte_t* data) {
 // Set up simulator mode, frequency divisor which will drive the FPGA
 // and analog mux selection.
 	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
 	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 	SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
 	RELAY_OFF();