diff --git a/diffoscope/comparators/apk.py b/diffoscope/comparators/apk.py
index 061fbbb0..ce49b835 100644
--- a/diffoscope/comparators/apk.py
+++ b/diffoscope/comparators/apk.py
@@ -335,7 +335,14 @@ def get_v2_signing_keys(path):
         return "\n".join(textwrap.wrap(binascii.hexlify(x).decode("utf-8")))

     output = []
-    for k, v in sorted(instance._v2_blocks.items()):
+    blocks = instance._v2_blocks
+    if isinstance(blocks, dict):
+        blocks = blocks.items()
+    else:
+        # androguard >= 4.1.4 preserves blocks with duplicate IDs in a list.
+        blocks = ((block.id, block.data) for block in blocks)
+
+    for k, v in sorted(blocks):
         output.append("Key {}:\n{}\n".format(hex(k), format_key(v)))

     return "\n".join(output)