diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7f22d006..5303b0be 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -113,17 +113,14 @@ jobs:
             cargo test --no-default-features --features i2c,no-boards -p riot-rs -p riot-rs-embassy -p riot-rs-runqueue -p riot-rs-threads -p riot-rs-macros
             cargo test -p rbi -p ringbuffer -p coapcore
 
-      - run: echo 'RUSTFLAGS=--cfg context="rp2040"' >> $GITHUB_ENV
       - name: cargo test for RP
-        run: cargo test --features external-interrupts,i2c,embassy-rp/rp2040 -p riot-rs-rp
+        run: RUSTFLAGS='--cfg context="rp2040"' cargo test --features external-interrupts,i2c,embassy-rp/rp2040 -p riot-rs-rp
 
-      - run: echo 'RUSTFLAGS=--cfg context="nrf52840"' >> $GITHUB_ENV
       - name: cargo test for nRF
-        run: cargo test --features external-interrupts,i2c,'embassy-nrf/nrf52840' -p riot-rs-nrf
+        run: RUSTFLAGS='--cfg context="nrf52840"' cargo test --features external-interrupts,i2c,'embassy-nrf/nrf52840' -p riot-rs-nrf
 
-      - run: echo 'RUSTFLAGS=--cfg context="stm32wb55rg"' >> $GITHUB_ENV
       - name: cargo test for STM32
-        run: cargo test --features external-interrupts,i2c,'embassy-stm32/stm32wb55rg' -p riot-rs-stm32
+        run: RUSTFLAGS='--cfg context="stm32wb55rg"' cargo test --features external-interrupts,i2c,'embassy-stm32/stm32wb55rg' -p riot-rs-stm32
 
   lint:
     runs-on: ubuntu-latest