diff --git a/src/repo.test.ts b/src/repo.test.ts
index aad954d..517ad08 100644
--- a/src/repo.test.ts
+++ b/src/repo.test.ts
@@ -175,10 +175,7 @@ describe('repo', () => {
         .calledWith('git', ['diff', 'v1.0.0', 'HEAD', '--name-only'], {
           cwd: '/path/to/repo',
         })
-        .mockResolvedValue([
-          '/path/to/repo/file1',
-          '/path/to/repo/subdirectory/file1',
-        ]);
+        .mockResolvedValue(['file1', 'subdirectory/file1']);
 
       const hasChanges = await hasChangesInDirectorySinceGitTag(
         '/path/to/repo',
@@ -194,7 +191,7 @@ describe('repo', () => {
         .calledWith('git', ['diff', 'v2.0.0', 'HEAD', '--name-only'], {
           cwd: '/path/to/repo',
         })
-        .mockResolvedValue(['/path/to/repo/file1', '/path/to/repo/file2']);
+        .mockResolvedValue(['file1', 'file2']);
 
       const hasChanges = await hasChangesInDirectorySinceGitTag(
         '/path/to/repo',
diff --git a/src/repo.ts b/src/repo.ts
index a2488a3..2741101 100644
--- a/src/repo.ts
+++ b/src/repo.ts
@@ -1,3 +1,4 @@
+import path from 'path';
 import {
   runCommand,
   getStdoutFromCommand,
@@ -112,11 +113,14 @@ async function getFilesChangedSince(
   repositoryDirectoryPath: string,
   tagName: string,
 ): Promise<string[]> {
-  return await getLinesFromGitCommandWithin(repositoryDirectoryPath, 'diff', [
-    tagName,
-    'HEAD',
-    '--name-only',
-  ]);
+  const partialFilePaths = await getLinesFromGitCommandWithin(
+    repositoryDirectoryPath,
+    'diff',
+    [tagName, 'HEAD', '--name-only'],
+  );
+  return partialFilePaths.map((partialFilePath) =>
+    path.join(repositoryDirectoryPath, partialFilePath),
+  );
 }
 
 /**