diff --git a/.github/actions/run-fuzzers/action.yml b/.github/actions/run-fuzzers/action.yml
index 2e027aae15..c20635d40e 100644
--- a/.github/actions/run-fuzzers/action.yml
+++ b/.github/actions/run-fuzzers/action.yml
@@ -53,11 +53,11 @@ inputs:
   report-unreproducible-crashes:
     description: 'If True, then unreproducible crashes will be reported.'
     required: false
-    default: False
+    default: false
   minimize-crashes:
     description: 'If True, reportable crashes will be minimized.'
     required: false
-    default: False
+    default: false
   parallel-fuzzing:
     description: "Whether to use all available cores for fuzzing."
     required: false
@@ -91,7 +91,11 @@ runs:
     REPORT_UNREPRODUCIBLE_CRASHES: ${{ inputs.report-unreproducible-crashes }}
     OUTPUT_SARIF: ${{ inputs.output-sarif }}
     MINIMIZE_CRASHES: ${{ inputs.minimize-crashes }}
-    CFL_PLATFORM: 'github'
+    CFL_PLATFORM: 'standalone'  # don't access GitHub artifacts
+    FILESTORE_ROOT_DIR: '/no/such/dir'  # no corpus is available
+    WORKSPACE: '/github/workspace'
+    REPOSITORY: 'trezor-firmware'
+    CIFUZZ_DEBUG: 'True'
     PARALLEL_FUZZING: ${{ inputs.parallel-fuzzing }}
     REPORT_TIMEOUTS: ${{ inputs.report-timeouts }}
     REPORT_OOMS: ${{ inputs.report-ooms}}
diff --git a/.github/workflows/cflite.yml b/.github/workflows/cflite.yml
index dc75831586..f53decea1d 100644
--- a/.github/workflows/cflite.yml
+++ b/.github/workflows/cflite.yml
@@ -21,6 +21,7 @@ jobs:
       matrix:
         sanitizer: [address]
     steps:
+      - uses: actions/checkout@v4  # needed to use the modified `run-fuzzers` action
       - name: Build Fuzzers (${{ matrix.sanitizer }})
         id: build
         uses: google/clusterfuzzlite/actions/build_fuzzers@v1
@@ -29,7 +30,7 @@ jobs:
           language: c
       - name: Run Fuzzers (${{ matrix.sanitizer }})
         id: run
-        uses: google/clusterfuzzlite/actions/run_fuzzers@v1
+        uses: ./.github/actions/run-fuzzers
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           fuzz-seconds: 400