diff --git a/lib/actions-util.test.js b/lib/actions-util.test.js
index b8d28febd2..2db9dc38be 100644
--- a/lib/actions-util.test.js
+++ b/lib/actions-util.test.js
@@ -94,6 +94,30 @@ const util_1 = require("./util");
         getAdditionalInputStub.restore();
     });
 });
+(0, ava_1.default)("getRef() returns CODE_SCANNING_REF as a fallback for GITHUB_REF", async (t) => {
+    await (0, util_1.withTmpDir)(async (tmpDir) => {
+        (0, testing_utils_1.setupActionsVars)(tmpDir, tmpDir);
+        const expectedRef = "refs/pull/1/HEAD";
+        const currentSha = "a".repeat(40);
+        process.env["CODE_SCANNING_REF"] = expectedRef;
+        process.env["GITHUB_REF"] = "";
+        process.env["GITHUB_SHA"] = currentSha;
+        const actualRef = await actionsutil.getRef();
+        t.deepEqual(actualRef, expectedRef);
+    });
+});
+(0, ava_1.default)("getRef() returns GITHUB_REF over CODE_SCANNING_REF if both are provided", async (t) => {
+    await (0, util_1.withTmpDir)(async (tmpDir) => {
+        (0, testing_utils_1.setupActionsVars)(tmpDir, tmpDir);
+        const expectedRef = "refs/pull/1/merge";
+        const currentSha = "a".repeat(40);
+        process.env["CODE_SCANNING_REF"] = "refs/pull/1/HEAD";
+        process.env["GITHUB_REF"] = expectedRef;
+        process.env["GITHUB_SHA"] = currentSha;
+        const actualRef = await actionsutil.getRef();
+        t.deepEqual(actualRef, expectedRef);
+    });
+});
 (0, ava_1.default)("getRef() throws an error if only `ref` is provided as an input", async (t) => {
     await (0, util_1.withTmpDir)(async (tmpDir) => {
         (0, testing_utils_1.setupActionsVars)(tmpDir, tmpDir);
diff --git a/lib/actions-util.test.js.map b/lib/actions-util.test.js.map
index 62afe19008..ae9c9857f2 100644
--- a/lib/actions-util.test.js.map
+++ b/lib/actions-util.test.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/actions-util.test.ts b/src/actions-util.test.ts
index c1d5175b18..6235a33590 100644
--- a/src/actions-util.test.ts
+++ b/src/actions-util.test.ts
@@ -88,6 +88,34 @@ test("getRef() returns ref provided as an input and ignores current HEAD", async
   });
 });
 
+test("getRef() returns CODE_SCANNING_REF as a fallback for GITHUB_REF", async (t) => {
+  await withTmpDir(async (tmpDir: string) => {
+    setupActionsVars(tmpDir, tmpDir);
+    const expectedRef = "refs/pull/1/HEAD";
+    const currentSha = "a".repeat(40);
+    process.env["CODE_SCANNING_REF"] = expectedRef;
+    process.env["GITHUB_REF"] = "";
+    process.env["GITHUB_SHA"] = currentSha;
+
+    const actualRef = await actionsutil.getRef();
+    t.deepEqual(actualRef, expectedRef);
+  });
+});
+
+test("getRef() returns GITHUB_REF over CODE_SCANNING_REF if both are provided", async (t) => {
+  await withTmpDir(async (tmpDir: string) => {
+    setupActionsVars(tmpDir, tmpDir);
+    const expectedRef = "refs/pull/1/merge";
+    const currentSha = "a".repeat(40);
+    process.env["CODE_SCANNING_REF"] = "refs/pull/1/HEAD";
+    process.env["GITHUB_REF"] = expectedRef;
+    process.env["GITHUB_SHA"] = currentSha;
+
+    const actualRef = await actionsutil.getRef();
+    t.deepEqual(actualRef, expectedRef);
+  });
+});
+
 test("getRef() throws an error if only `ref` is provided as an input", async (t) => {
   await withTmpDir(async (tmpDir: string) => {
     setupActionsVars(tmpDir, tmpDir);