diff --git a/variants/diy/v1/variant.h b/variants/diy/v1/variant.h
index 4802dbe89..8a2df3f2b 100644
--- a/variants/diy/v1/variant.h
+++ b/variants/diy/v1/variant.h
@@ -53,4 +53,5 @@
 // Internally the TTGO module hooks the SX126x-DIO2 in to control the TX/RX switch
 // (which is the default for the sx1262interface code)
 #define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
 #endif
diff --git a/variants/diy/v1_1/variant.h b/variants/diy/v1_1/variant.h
index 8a006d0d2..1c8110301 100644
--- a/variants/diy/v1_1/variant.h
+++ b/variants/diy/v1_1/variant.h
@@ -54,4 +54,5 @@
 // Internally the TTGO module hooks the SX126x-DIO2 in to control the TX/RX switch
 // (which is the default for the sx1262interface code)
 #define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
 #endif