diff --git a/gbp/git/repository.py b/gbp/git/repository.py
index 6cc3cd9f..fdca52a8 100644
--- a/gbp/git/repository.py
+++ b/gbp/git/repository.py
@@ -134,7 +134,7 @@ def __init__(self, path, toplevel=True):
     def __build_env(extra_env):
         """Prepare environment for subprocess calls"""
         env = None
-        if extra_env is not None:
+        if extra_env:
             env = os.environ.copy()
             env.update(extra_env)
         return env
@@ -1450,11 +1450,14 @@ def rename_file(self, old, new):
 
 #{ Comitting
 
-    def _commit(self, msg, args=[], author_info=None):
-        extra_env = author_info.get_author_env() if author_info else None
+    def _commit(self, msg, args=[], author_info=None, committer_info=None):
+        extra_env = author_info.get_author_env() if author_info else {}
+        if committer_info:
+            extra_env.update(committer_info.get_committer_env())
         self._git_command("commit", ['-q', '-m', msg] + args, extra_env=extra_env)
 
-    def commit_staged(self, msg, author_info=None, edit=False):
+    def commit_staged(self, msg, author_info=None, edit=False,
+                      committer_info=None):
         """
         Commit currently staged files to the repository
 
@@ -1464,24 +1467,30 @@ def commit_staged(self, msg, author_info=None, edit=False):
         @type author_info: L{GitModifier}
         @param edit: whether to spawn an editor to edit the commit info
         @type edit: C{bool}
+        @param committer_info: committer information
+        @type committer_info: L{GitModifier}
         """
         args = GitArgs()
         args.add_true(edit, '--edit')
-        self._commit(msg=msg, args=args.args, author_info=author_info)
+        self._commit(msg=msg, args=args.args, author_info=author_info,
+                     committer_info=committer_info)
 
-    def commit_all(self, msg, author_info=None, edit=False):
+    def commit_all(self, msg, author_info=None, edit=False, committer_info=None):
         """
         Commit all changes to the repository
         @param msg: commit message
         @type msg: C{str}
         @param author_info: authorship information
         @type author_info: L{GitModifier}
+        @param committer_info: committer information
+        @type committer_info: L{GitModifier}
         """
         args = GitArgs('-a')
         args.add_true(edit, '--edit')
-        self._commit(msg=msg, args=args.args, author_info=author_info)
+        self._commit(msg=msg, args=args.args, author_info=author_info,
+                     committer_info=committer_info)
 
-    def commit_files(self, files, msg, author_info=None):
+    def commit_files(self, files, msg, author_info=None, committer_info=None):
         """
         Commit the given files to the repository
 
@@ -1491,10 +1500,13 @@ def commit_files(self, files, msg, author_info=None):
         @type msg: C{str}
         @param author_info: authorship information
         @type author_info: L{GitModifier}
+        @param committer_info: committer information
+        @type committer_info: L{GitModifier}
         """
         if isinstance(files, str):
             files = [files]
-        self._commit(msg=msg, args=files, author_info=author_info)
+        self._commit(msg=msg, args=files, author_info=author_info,
+                     committer_info=committer_info)
 
     def commit_dir(self, unpack_dir, msg, branch, other_parents=None,
                    author={}, committer={}, create_missing_branch=False):