diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e29832a..3d2f794 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,18 +52,21 @@ jobs:
         env:
           ESP_IDF_VERSION: ${{ matrix.idf-version }}
           ESP_IDF_SDKCONFIG_DEFAULTS: "${{ github.workspace }}/.github/configs/sdkconfig.defaults"
+          RUSTFLAGS: "${{ startsWith(matrix.idf-version, 'v5') && '--cfg espidf_time64' || '' }}"
         run: cargo clippy --no-deps --target ${{ matrix.target }} -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort -- -Dwarnings
 
       - name: Build | Compile
         env:
           ESP_IDF_VERSION: ${{ matrix.idf-version }}
           ESP_IDF_SDKCONFIG_DEFAULTS: "${{ github.workspace }}/.github/configs/sdkconfig.defaults"
+          RUSTFLAGS: "${{ startsWith(matrix.idf-version, 'v5') && '--cfg espidf_time64' || '' }}"
         run: cargo build --target ${{ matrix.target }} -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort
 
       - name: Build | Compile, no_std
         env:
           ESP_IDF_VERSION: ${{ matrix.idf-version }}
           ESP_IDF_SDKCONFIG_DEFAULTS: "${{ github.workspace }}/.github/configs/sdkconfig.defaults"
+          RUSTFLAGS: "${{ startsWith(matrix.idf-version, 'v5') && '--cfg espidf_time64' || '' }}"
         run: cargo build --no-default-features --target ${{ matrix.target }} -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort
 
       - name: Setup | ldproxy
@@ -77,8 +80,8 @@ jobs:
         env:
           ESP_IDF_VERSION: ${{ matrix.idf-version }}
           ESP_IDF_SDKCONFIG_DEFAULTS: "${{ github.workspace }}/.github/configs/sdkconfig.defaults"
-          RUSTFLAGS: "${{ '-C default-linker-libraries' }}"
+          RUSTFLAGS: "${{ startsWith(matrix.idf-version, 'v5') && '--cfg espidf_time64' || '' }} ${{ '-C default-linker-libraries' }}"
           WIFI_SSID: "ssid"
           WIFI_PASS: "pass"
         if: matrix.target == 'riscv32imc-esp-espidf'
-        run: cargo build --examples --features examples --target ${{ matrix.target }} -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort
+        run: cargo build --examples --features examples --target ${{ matrix.target }} -Zbuild-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort
\ No newline at end of file