diff --git a/gitcmd/merge_temprepo.go b/gitcmd/merge_temprepo.go
index 06acffa..1f6e1a9 100644
--- a/gitcmd/merge_temprepo.go
+++ b/gitcmd/merge_temprepo.go
@@ -56,9 +56,16 @@ func (r *Repository) MergeViaTempRepo(base, head, message, authorName, authorEma
 		return nil, err
 	}
 	defer cleanup()
+	identityEnv := []string{
+		"GIT_AUTHOR_NAME=" + authorName,
+		"GIT_AUTHOR_EMAIL=" + authorEmail,
+		"GIT_COMMITTER_NAME=" + authorName,
+		"GIT_COMMITTER_EMAIL=" + authorEmail,
+	}
 
 	if !noFF && r.isAncestor(baseSHA, headSHA) {
-		stdout, stderr, err := NewCommand("merge", "--ff-only").AddDynamicArguments(headSHA).WithDir(temp).RunStdString(r.ctx)
+		stdout, stderr, err := NewCommand("merge", "--ff-only").AddDynamicArguments(headSHA).
+			WithDir(temp).WithEnv(identityEnv...).RunStdString(r.ctx)
 		if err != nil {
 			return nil, commandFailure("merge --ff-only", err, stdout, stderr)
 		}
@@ -73,7 +80,7 @@ func (r *Repository) MergeViaTempRepo(base, head, message, authorName, authorEma
 	}
 
 	mergeOut, mergeErrOut, mergeErr := NewCommand("merge", "--no-ff", "--no-commit").
-		AddDynamicArguments(headSHA).WithDir(temp).RunStdString(r.ctx)
+		AddDynamicArguments(headSHA).WithDir(temp).WithEnv(identityEnv...).RunStdString(r.ctx)
 	if mergeErr != nil {
 		conflicts, err := r.unmergedPaths(temp)
 		if err != nil {