diff --git a/.github/workflows/qa.yml b/.github/workflows/qa.yml
index 70d3a00..f4a7be3 100644
--- a/.github/workflows/qa.yml
+++ b/.github/workflows/qa.yml
@@ -134,3 +134,21 @@ jobs:
       - name: Assert
         run: |
           ./test/assertFileExists ./test/example-project/.scannerwork/report-task.txt
+  runnerDebugUsedTest:
+    name: >
+      'RUNNER_DEBUG' is used
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Run action with debug mode
+        uses: ./
+        with:
+          args: -Dsonar.scanner.dumpToFile=./output.properties
+        env:
+          RUNNER_DEBUG: 1
+          SONAR_HOST_URL: http://not_actually_used
+      - name: Assert
+        run: |
+          ./test/assertFileContains ./output.properties "sonar.verbose=true"
diff --git a/entrypoint.sh b/entrypoint.sh
index d0b4e1e..0d0ef25 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,7 +30,12 @@ if [[ -f "${INPUT_PROJECTBASEDIR%/}/build.gradle" ]]; then
   exit 1
 fi
 
+debug_flag=''
+if [[ "$RUNNER_DEBUG" == '1' ]]; then
+  debug_flag='--debug'
+fi
+
 unset JAVA_HOME
 
-sonar-scanner -Dsonar.projectBaseDir=${INPUT_PROJECTBASEDIR} ${INPUT_ARGS}
+sonar-scanner $debug_flag -Dsonar.projectBaseDir=${INPUT_PROJECTBASEDIR} ${INPUT_ARGS}