diff --git a/borg/archive.py b/borg/archive.py
index ba06850c5..7c0d56de1 100644
--- a/borg/archive.py
+++ b/borg/archive.py
@@ -201,14 +201,12 @@ class Archive:
         return format_timedelta(self.end-self.start)
 
     def __str__(self):
-        buf = '''Archive name: {0.name}
+        return '''Archive name: {0.name}
 Archive fingerprint: {0.fpr}
 Start time: {0.start:%c}
 End time: {0.end:%c}
 Duration: {0.duration}
-Number of files: {0.stats.nfiles}
-{0.cache}'''.format(self)
-        return buf
+Number of files: {0.stats.nfiles}'''.format(self)
 
     def __repr__(self):
         return 'Archive(%r)' % self.name
diff --git a/borg/cache.py b/borg/cache.py
index 3fab7cef2..729149c21 100644
--- a/borg/cache.py
+++ b/borg/cache.py
@@ -78,20 +78,20 @@ class Cache:
         self.close()
 
     def __str__(self):
-        return format(self, """\
+        fmt = """\
 All archives:   {0.total_size:>20s} {0.total_csize:>20s} {0.unique_csize:>20s}
 
                        Unique chunks         Total chunks
-Chunk index:    {0.total_unique_chunks:20d} {0.total_chunks:20d}""")
+Chunk index:    {0.total_unique_chunks:20d} {0.total_chunks:20d}"""
+        return fmt.format(self.format_tuple())
 
-    def __format__(self, format_spec):
+    def format_tuple(self):
         # XXX: this should really be moved down to `hashindex.pyx`
         Summary = namedtuple('Summary', ['total_size', 'total_csize', 'unique_size', 'unique_csize', 'total_unique_chunks', 'total_chunks'])
         stats = Summary(*self.chunks.summarize())._asdict()
         for field in ['total_size', 'total_csize', 'unique_csize']:
             stats[field] = format_file_size(stats[field])
-        stats = Summary(**stats)
-        return format_spec.format(stats)
+        return Summary(**stats)
 
     def _confirm(self, message, env_var_override=None):
         print(message, file=sys.stderr)
diff --git a/borg/helpers.py b/borg/helpers.py
index b793ca492..a60776e12 100644
--- a/borg/helpers.py
+++ b/borg/helpers.py
@@ -163,8 +163,7 @@ class Statistics:
 
     summary = """\
                        Original size      Compressed size    Deduplicated size
-{label:15} {stats.osize_fmt:>20s} {stats.csize_fmt:>20s} {stats.usize_fmt:>20s}
-"""
+{label:15} {stats.osize_fmt:>20s} {stats.csize_fmt:>20s} {stats.usize_fmt:>20s}"""
     def __str__(self):
         return self.summary.format(stats=self, label='This archive:')
 
diff --git a/borg/testsuite/helpers.py b/borg/testsuite/helpers.py
index ac2cbacad..577b08430 100644
--- a/borg/testsuite/helpers.py
+++ b/borg/testsuite/helpers.py
@@ -438,8 +438,7 @@ def tests_stats_progress(stats, columns = 80):
 def test_stats_format(stats):
     assert str(stats) == """\
                        Original size      Compressed size    Deduplicated size
-This archive:                   10 B                 10 B                 10 B
-"""
+This archive:                   10 B                 10 B                 10 B"""
     s = "{0.osize_fmt}".format(stats)
     assert s == "10 B"
     # kind of redundant, but id is variable so we can't match reliably