diff --git a/platformio.ini b/platformio.ini
index a21cfc3b4..80c6df666 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -107,7 +107,7 @@ lib_deps =
 build_flags = ${env.build_flags} -Os 
 # -DRADIOLIB_GODMODE
 
-src_filter = ${env.src_filter} -<portduino/>
+build_src_filter = ${env.build_src_filter} -<portduino/>
 
 ; Common libs for environmental measurements (not included in native / portduino)
 [environmental]
@@ -124,8 +124,8 @@ lib_deps =
 [esp32_base]
 extends = arduino_base
 platform = espressif32@3.5.0
-src_filter = 
-  ${arduino_base.src_filter} -<nrf52/>
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<nrf52/>
 upload_speed = 921600
 debug_init_break = tbreak setup
 
@@ -179,8 +179,8 @@ board_build.partitions = partition-table.csv
 ;board = cubecell_board_plus
 ; FIXME, bug in cubecell arduino - they are supposed to set ARDUINO
 ;build_flags = ${arduino_base.build_flags} -DARDUINO=100 -Isrc/cubecell
-;src_filter = 
-;  ${arduino_base.src_filter} -<esp32/> -<nrf52/>
+;build_src_filter = 
+;  ${arduino_base.build_src_filter} -<esp32/> -<nrf52/>
   
 ; Common settings for NRF52 based targets
 [nrf52_base]
@@ -195,8 +195,8 @@ build_flags =
   -Isrc/nrf52 
   -Isdk-nrfxlib/crypto/nrf_oberon/include -Lsdk-nrfxlib/crypto/nrf_oberon/lib/cortex-m4/hard-float/ -lliboberon_3.0.7 
 ;-DCFG_DEBUG=3
-src_filter = 
-  ${arduino_base.src_filter} -<esp32/> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<plugins/esp32> -<mqtt/>
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<esp32/> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<plugins/esp32> -<mqtt/>
 lib_ignore =
   BluetoothOTA
 ; monitor_port = /dev/ttyACM1
diff --git a/variants/WisCore_RAK4631_Board/platformio.ini b/variants/WisCore_RAK4631_Board/platformio.ini
index cfd9297e0..cb8b151cb 100644
--- a/variants/WisCore_RAK4631_Board/platformio.ini
+++ b/variants/WisCore_RAK4631_Board/platformio.ini
@@ -5,7 +5,7 @@ board = wiscore_rak4631
 # add our variants files to the include and src paths
 # define build flags for the TFT_eSPI library
 build_flags = ${nrf52840_base.build_flags} -Ivariants/WisCore_RAK4631_Board -D RAK_BASE_5005
-src_filter = ${nrf52_base.src_filter} +<../variants/WisCore_RAK4631_Board>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/WisCore_RAK4631_Board>
 debug_tool = jlink
 
 [env:rak4631_19003]
@@ -14,7 +14,7 @@ board = wiscore_rak4631
 # add our variants files to the include and src paths
 # define build flags for the TFT_eSPI library
 build_flags = ${nrf52840_base.build_flags} -Ivariants/WisCore_RAK4631_Board -D RAK_BASE_19003
-src_filter = ${nrf52_base.src_filter} +<../variants/WisCore_RAK4631_Board>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/WisCore_RAK4631_Board>
 debug_tool = jlink
 ; If not set we will default to uploading over serial (first it forces bootloader entry by talking 1200bps to cdcacm)
 ;upload_protocol = jlink
\ No newline at end of file
diff --git a/variants/lora_isp4520/platformio.ini b/variants/lora_isp4520/platformio.ini
index 0a946c7a8..fb9fdf913 100644
--- a/variants/lora_isp4520/platformio.ini
+++ b/variants/lora_isp4520/platformio.ini
@@ -6,7 +6,7 @@ board = lora_isp4520
 build_flags = ${nrf52_base.build_flags} -Ivariants/lora_isp4520
 
 # No screen and GPS on the board. We still need RTC.cpp for the RTC clock.
-src_filter = ${nrf52_base.src_filter} +<../variants/lora_isp4520> -<graphics> -<gps> +<gps/GPS.cpp> +<gps/RTC.cpp>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/lora_isp4520> -<graphics> -<gps> +<gps/GPS.cpp> +<gps/RTC.cpp>
 lib_ignore = ${nrf52_base.lib_ignore} 
   ESP8266_SSD1306
   SparkFun Ublox Arduino Library
diff --git a/variants/lora_relay_v1/platformio.ini b/variants/lora_relay_v1/platformio.ini
index 78b338d9b..312108979 100644
--- a/variants/lora_relay_v1/platformio.ini
+++ b/variants/lora_relay_v1/platformio.ini
@@ -14,7 +14,7 @@ build_flags = ${nrf52840_base.build_flags} -Ivariants/lora_relay_v1
   -DTFT_DC=ST7735_RS
   -DTFT_RST=ST7735_RESET
   -DSPI_FREQUENCY=27000000
-src_filter = ${nrf52_base.src_filter} +<../variants/lora_relay_v1>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/lora_relay_v1>
 lib_deps = 
   ${nrf52840_base.lib_deps}
   SparkFun BQ27441 LiPo Fuel Gauge Arduino Library
diff --git a/variants/lora_relay_v2/platformio.ini b/variants/lora_relay_v2/platformio.ini
index 1a12713c8..f35b14c02 100644
--- a/variants/lora_relay_v2/platformio.ini
+++ b/variants/lora_relay_v2/platformio.ini
@@ -16,7 +16,7 @@ build_flags = ${nrf52840_base.build_flags} -Ivariants/lora_relay_v2
   -DSPI_FREQUENCY=27000000
   -DTFT_WR=ST7735_SDA
   -DTFT_SCLK=ST7735_SCK
-src_filter = ${nrf52_base.src_filter} +<../variants/lora_relay_v2>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/lora_relay_v2>
 lib_deps = 
   ${nrf52840_base.lib_deps}
   SparkFun BQ27441 LiPo Fuel Gauge Arduino Library
diff --git a/variants/portduino/platformio.ini b/variants/portduino/platformio.ini
index c4d561558..758998f73 100644
--- a/variants/portduino/platformio.ini
+++ b/variants/portduino/platformio.ini
@@ -1,8 +1,8 @@
 ; The Portduino based sim environment on top of any host OS, all hardware will be simulated
 [env:native]
 platform = https://github.com/geeksville/platform-native.git 
-src_filter = 
-  ${env.src_filter} 
+build_src_filter = 
+  ${env.build_src_filter} 
   -<esp32/> 
   -<nimble/> 
   -<nrf52/> 
@@ -20,8 +20,8 @@ lib_deps =
 ; The Portduino based sim environment on top of a linux OS and touching linux hardware devices
 [env:linux]
 platform = https://github.com/geeksville/platform-native.git 
-src_filter = 
-  ${env.src_filter} 
+build_src_filter = 
+  ${env.build_src_filter} 
   -<esp32/> 
   -<nimble/> 
   -<nrf52/> 
diff --git a/variants/ppr1/platformio.ini b/variants/ppr1/platformio.ini
index 6592e4718..40ad508f9 100644
--- a/variants/ppr1/platformio.ini
+++ b/variants/ppr1/platformio.ini
@@ -3,6 +3,6 @@
 extends = nrf52_base
 board = ppr1
 build_flags = ${nrf52_base.build_flags} -Ivariants/ppr1
-src_filter = ${nrf52_base.src_filter} +<../variants/ppr1>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/ppr1>
 lib_deps = 
   ${arduino_base.lib_deps}
\ No newline at end of file
diff --git a/variants/t-echo/platformio.ini b/variants/t-echo/platformio.ini
index 495eaf91a..5d496c76f 100644
--- a/variants/t-echo/platformio.ini
+++ b/variants/t-echo/platformio.ini
@@ -9,7 +9,7 @@ upload_protocol = jlink
 # -DBUSY_PIN=3 -DRST_PIN=2 -DDC_PIN=28 -DCS_PIN=30
 # add -DCFG_SYSVIEW if you want to use the Segger systemview tool for OS profiling.
 build_flags = ${nrf52840_base.build_flags} -Ivariants/t-echo 
-src_filter = ${nrf52_base.src_filter} +<../variants/t-echo>
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/t-echo>
 lib_deps = 
   ${nrf52840_base.lib_deps}
   https://github.com/geeksville/GxEPD2.git