diff --git a/gitdiff/fuzz_test.go b/gitdiff/fuzz_test.go
new file mode 100644
index 0000000..19b5198
--- /dev/null
+++ b/gitdiff/fuzz_test.go
@@ -0,0 +1,38 @@
+// +build gofuzzbeta
+
+package gitdiff
+
+import (
+	"bytes"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func FuzzParse(f *testing.F) {
+	// Use existing test files as the seed corpus
+	// TODO(bkeyes): once supported, should this use static files instead?
+	if err := filepath.WalkDir("testdata", func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() || !strings.HasSuffix(path, ".patch") {
+			return nil
+		}
+		b, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+		f.Add(b)
+		return nil
+	}); err != nil {
+		f.Fatalf("error creating seed corpus: %v", err)
+	}
+
+	f.Fuzz(func(t *testing.T, b []byte) {
+		t.Parallel()
+		Parse(bytes.NewReader(b))
+	})
+}