diff --git a/variants/heltec_t096/platformio.ini b/variants/heltec_t096/platformio.ini
index e820bf58d..4da11c0ce 100644
--- a/variants/heltec_t096/platformio.ini
+++ b/variants/heltec_t096/platformio.ini
@@ -29,6 +29,7 @@ build_flags = ${nrf52_base.build_flags}
   -D SX126X_DIO3_TCXO_VOLTAGE=1.8
   -D SX126X_CURRENT_LIMIT=140
   -D SX126X_RX_BOOSTED_GAIN=1
+  -D USE_CC310_ED25519=1
   -D PIN_VEXT_EN=26   ; Vext is connected to VDD which is also connected to TFT & GPS
   -D PIN_VEXT_EN_ACTIVE=HIGH
   -D PIN_GPS_RX=25
diff --git a/variants/t1000-e/platformio.ini b/variants/t1000-e/platformio.ini
index 43a3d93f6..9218c5787 100644
--- a/variants/t1000-e/platformio.ini
+++ b/variants/t1000-e/platformio.ini
@@ -18,6 +18,7 @@ build_flags = ${nrf52_base.build_flags}
   -D LORA_TX_POWER=22
   -D RF_SWITCH_TABLE
   -D RX_BOOSTED_GAIN=true
+  -D USE_CC310_ED25519=1
   -D P_LORA_BUSY=7 ; P0.7
   -D P_LORA_SCLK=11 ; P0.11
   -D P_LORA_NSS=12 ; P0.12