diff --git a/scripts/code_style.py b/scripts/code_style.py
index d3f89d9..e98fb2b 100755
--- a/scripts/code_style.py
+++ b/scripts/code_style.py
@@ -102,8 +102,10 @@
                "--name-only", "--pretty=", "--"] + src_files
         output = subprocess.check_output(cmd, universal_newlines=True)
         committed_changed_files = output.split()
+
         # ... the framework submodule
-        cmd = ["git", "-C", "framework", "log", since + "..HEAD",
+        framework_since = get_submodule_hash(since, "framework")
+        cmd = ["git", "-C", "framework", "log", framework_since + "..HEAD",
                "--name-only", "--pretty=", "--"] + framework_src_files
         output = subprocess.check_output(cmd, universal_newlines=True,
                                          env=framework_env)
@@ -135,6 +137,12 @@
                          is_file_autogenerated(filename))]
     return src_files
 
+def get_submodule_hash(commit: str, submodule: str) -> str:
+    """Get the commit hash of a submodule at a given commit in the Git repository."""
+    cmd = ["git", "ls-tree", commit, submodule]
+    output = subprocess.check_output(cmd, universal_newlines=True)
+    return output.split()[2]
+
 def get_uncrustify_version() -> str:
     """
     Get the version string from Uncrustify