diff --git a/action.yml b/action.yml
index ce41451..9fe2eee 100644
--- a/action.yml
+++ b/action.yml
@@ -12,10 +12,6 @@ inputs:
     description: "The path to the repository where the action will be used, e.g. 'alstr/my-repo' (automatically set)"
     required: true
     default: "${{ github.repository }}"
-  BEFORE:
-    description: "The SHA of the last pushed commit (automatically set)"
-    required: true
-    default: "${{ github.event.before }}"
   SHA:
     description: "The SHA of the latest commit (automatically set)"
     required: true
diff --git a/main.py b/main.py
index e18e7cf..c13e8f9 100644
--- a/main.py
+++ b/main.py
@@ -48,7 +48,6 @@ class GitHubClient(object):
 
     def __init__(self):
         self.repo = os.getenv('INPUT_REPO')
-        self.before = os.getenv('INPUT_BEFORE')
         self.sha = os.getenv('INPUT_SHA')
         self.token = os.getenv('INPUT_TOKEN')
         self.issues_url = f'{self.repos_url}{self.repo}/issues'
@@ -62,12 +61,8 @@ class GitHubClient(object):
         self._get_existing_issues()
 
     def get_last_diff(self):
-        """Get the last diff based on the SHA of the last two commits."""
-        if not self.before or self.before.startswith('000000'):
-            # Last commit SHA is empty which means this is the first commit of the branch
-            diff_url = f'{self.repos_url}{self.repo}/commits/{self.sha}'
-        else:    
-            diff_url = f'{self.repos_url}{self.repo}/compare/{self.before}...{self.sha}'
+        """Get the last commit diff."""
+        diff_url = f'{self.repos_url}{self.repo}/commits/{self.sha}'
         diff_headers = {
             'Accept': 'application/vnd.github.v3.diff',
             'Authorization': f'token {self.token}'